1. 5-1 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein DRUGS Chapter 5

2. 5-2 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Introduction A drug can be defined as a natural or synthetic substance that is used to produce physiological or psychological effects in humans or other higher order animals. Narcotic drugs are analgesics, meaning they relieve pain by a depressing action on the central nervous system. This effects functions such as blood pressure, pulse rate and breathing rate.

3. 5-3 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Introduction The regular use of a narcotic drug will invariably lead to physical dependence. The most common source for these narcotic drugs is opium, extracted from poppies.

4. 5-4 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Opiates Morphine is readily extracted from opium and is used to synthesize heroin. Addicts frequently dissolve heroin in water by heating it in a spoon, and then inject in the skin. Heroin produces a “high” that is accompanied by drowsiness and a sense of well-being that generally last for three to four hours.

5. 5-5 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Opiates - Heroin

6. 5-6 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Opiates Codeine is also present in opium, but it is usually prepared synthetically from morphine. OxyContin, with the active ingredient oxycodone, is not derived from opium or morphine, but does have the same physiological effects on the body as do opium narcotics.

7. 5-7 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Other Opiates OxyContin is prescribed to a million patients for treatment of chronic pain. Methadone is another well-known synthetic opiate. Methadone, which is pharmacologically related to heroin, appears to eliminate the addict’s desire for heroin while producing minimal side effects.

8. 5-8 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Hallucinogens Another class of drugs is hallucinogens; marijuana is the most well-known member of this class. Hallucinogens cause marked changes in normal thought processes, perceptions, and moods. Marijuana is the most controversial drug in this class because its long-term effects on health are still largely unknown.

9. 5-9 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Marijuana Marijuana refers to a preparation derived from the plant Cannabis. The chemical substance largely responsible for the hallucinogenic properties of marijuana is known as tetrahydrocannabinol, or THC. The THC content of Cannabis varies in different parts of the plant, generally decreasing in the following sequence: resin, flowers, leaves, with little THC in the stem, roots or seeds.

10. 5-10 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Marijuana The THC-rich Marijuana does not cause physical dependency, but the risk of harm is in heavy, long-term use. Lung cancer and psychological dependence is a real threat.

11. 5-11 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Other Hallucinogens Other hallucinogens include LSD, mescaline, PCP, psilocybin, and MDMA (Ecstasy). LSD is synthesized from lysergic acid, and can cause hallucinations that can last for 12 hours. Phencyclidine, or PCP, is often synthesized in clandestine laboratories and is often smoked, ingested, sniffed. LSD PCP

12. 5-12 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Other Hallucinogens Phencyclidine is often mixed with other drugs, such as LSD, or amphetamine, and is sold as a powder (“angel dust”), capsule, or tablet. Oral intake of PCP first leads to feelings of strength and invulnerability, which may turn to depression, tendencies toward violence, and suicide.

13. 5-13 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Depressants Depressants are another class of drugs. Depressants are substances used to depress the functions of the central nervous system. Depressants calm irritability and anxiety and may induce sleep. dextromethorphan

14. 5-14 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Depressants These include alcohol (ethanol), barbiturates, tranquilizers, and various substances that can be sniffed, such as airplane glue, model cement, or aerosol gas propellants such as freon. Alcohol (ethyl alcohol) enters the body’s bloodstream and quickly travels to the brain, where it acts to suppress the brain’s control of thought processes and muscle coordination.

15. 5-15 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Depressants Barbiturates, or “downers,” are normally taken orally and create a feeling of well-being, relax the body, and produce sleep. Tranquilizers, unlike barbiturates, produce a relaxing tranquility without impairment of high- thinking faculties or inducing sleep. Sniffing has immediate effects such as exhilaration, but impairs judgment and may cause liver, heart, and brain damage, or even death.

16. 5-16 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Stimulants The drug classification of stimulants includes amphetamines, sometimes known as “uppers” or “speed,” and cocaine, which in its free-base form is known as crack. Stimulants are substances taken to increase alertness or activity, followed by a decrease in fatigue and a loss of appetite. Cocaine

17. 5-17 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Stimulants

18. 5-18 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Stimulants Amphetamine and methamphetamine, often injected intravenously, cause an initial “rush,” followed by an intense feeling of pleasure. This is followed by a period of exhaustion and a prolonged period of depression. Cocaine, extracted from the leaves of Erythroxylin coca, causes increased alertness and vigor, accompanied by the suppression of hunger, fatigue, and boredom.

19. 5-19 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Cocaine

20. 5-20 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Stimulants Crack is cocaine mixed with baking soda and water, then heated. Crack is often smoked in glass pipes, and like cocaine stimulates the brain’s pleasure center.

21. 5-21 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Club Drugs The term club drugs refers to synthetic drugs that are used at nightclubs, bars, and raves (all- night dance parties). Substances that are often used as club drugs include, but are not limited to, MDMA (Ecstasy), GHB (gamma hydroxybutyrate), Rohypnol (“Roofies”), ketamine, and methamphetamine. GHB and Rohypnol are central nervous system depressants that are often connected with drug- facilitated sexual assault, rape, and robbery.

22. 5-22 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Club Drugs Methylenedioxymethamphetamine, also known as MDMA or Ecstasy, is a synthetic mind- altering drug that exhibits many hallucinogenic and amphetamine-like effects. Ecstasy enhances self-awareness and decreases inhibitions, however, seizures, muscle breakdown, stroke, kidney failure, and cardiovascular system failure often accompany chronic abuse.

23. 5-23 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Club Drugs Ketamine is primarily used as a veterinary animal anesthetic that in humans causes euphoria and hallucinations. Ketamine can also cause impaired motor functions, high blood pressure, amnesia, and mild respiratory depression.

24. 5-24 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Anabolic Steroids Yet another category of drugs is the anabolic steroids. These are synthetic compounds that are chemically related to the male sex hormone testosterone. Anabolic steroids are often abused by individuals who are interested in accelerating muscle growth.

25. 5-25 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Anabolic Steroids Side effects include unpredictable effects on mood and personality, depression, diminished sex drive, halting bone growth, and liver cancer.

26. 5-26 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drug-Control Laws The U.S. federal law known as the Controlled Substances Act will serve to illustrate a legal drug-classification system created to prevent and control drug abuse. This federal law establishes five schedules of classification for controlled dangerous substances on the basis of a drug’s –potential for abuse –potential for physical and psychological dependence –medical value

27. 5-27 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Schedules of Classification Schedule I drugs have a high potential for abuse and have no currently accepted medical use such as heroin, marijuana, methaqualone, K2 and LSD. Schedule II drugs have a high potential for abuse and have medical use with severe restrictions such as cocaine, PCP, and most amphetamine and barbiturate prescriptions. This includes most ADHD medications.

28. 5-28 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Schedules of Classification Schedule III drugs have less potential for abuse and a currently accepted medical use such as all barbiturate prescriptions not covered under Schedule II, such as codeine and anabolic steroids. Schedule IV drugs have a low potential for abuse and have a current medical use such as darvon, phenobarbital, and some tranquilizers such as diazepam (valium) and chlordiazepoxide (librium).

29. 5-29 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Schedules of Classification Schedule V drugs must show low abuse potential and have medical use such as opiate drug mixtures that contain nonnarcotic medicinal ingredients.

30. 5-30 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 30 Toxicology Toxicology—the study of the adverse effects of chemicals or physical agents on living organisms Types: Environmental—air, water, soil Consumer—foods, cosmetics, drugs Medical, clinical, forensic

31. 5-31 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 31 Postmortem—medical examiner or coroner Criminal—motor vehicle accidents (MVA) Workplace—drug testing Sports—human and animal Environment—industrial, catastrophic, terrorism

32. 5-32 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 32 Toxic substances may: Be a cause of death Contribute to death Cause impairment Explain behavior

33. 5-33 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 33 Aspects of Toxicity Dosage The chemical or physical form of the substance The mode of entry into the body Body weight and physiological conditions of the victim, including age and sex The time period of exposure The presence of other chemicals in the body or in the dose

34. 5-34 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 34 Lethal Dose LD 50 refers to the dose of a substance that kills half the test population, usually within four hours Expressed in milligrams of substance per kilogram of body weight

35. 5-35 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 35 Toxicity Classification LD 50 (rat,oral)Correlation to Ingestion by 150-lb Adult Human Toxicity <1 mg/kga taste to a dropextreme 1–50 mg/kgto a teaspoonhigh 50–500 mg/kgto an ouncemoderate 500–5,000 mg/kgto a pintslight 5–15 g/kgto a quartpractically nontoxic Over 15 g/kgmore than 1 quartrelatively harmless

36. 5-36 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 36 Symptoms of Various Types of Poisoning Symptom/Evidence Characteristic burns around the lips and mouth of victim Red or pink patches on the chest and thigh, unusually bright red lividity Black vomit Greenish-brown vomit Yellow vomit Coffee-brown vomit, onion or garlic odor Burnt almond odor Extreme diarrhea Nausea and vomiting, unconsciousness possibly blindness Type of Poison Caustic poison (lye) Carbon monoxide Sulfuric acid Hydrochloric acid Nitric acid Phosphorus Cyanide Arsenic, mercury Methyl (wood) or isopropyl (rubbing) alcohol

37. 5-37 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 37 To Prove a Case Prove a crime was committed Motive Intent Access to poison Access to victim Death was homicidal Death was caused by poison

38. 5-38 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 38 Most abused drug in America About 40 percent of all traffic deaths are alcohol-related Toxic—affecting the central nervous system, especially the brain Colorless liquid, generally diluted in water Acts as a depressant Alcohol appears in blood within minutes of consumption; 30–90 minutes for full absorption Detoxification—about 90 percent in the liver About 5 percent is excreted unchanged in breath, perspiration, and urine

39. 5-39 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein A major branch of forensic toxicology deals with the measurement of alcohol in the body for matters that pertain to violations of criminal law.

40. 5-40 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 40 Rate of Absorption Depends on: Amount of alcohol consumed The alcohol content of the beverage Time taken to consume it Quantity and type of food present in the stomach Physiology of the consumer

41. 5-41 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Toxicology of Alcohol The analysis of alcohol exemplifies the primary objective of forensic toxicology—the detection and isolation of drugs in the body for the purpose of determining their influence on human behavior. Alcohol, or ethyl alcohol, is a colorless liquid normally diluted with water and consumed as a beverage. Like any depressant, alcohol principally effects the central nervous system, particularly the brain.

42. 5-42 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Alcohol & Circulatory System Humans have a closed circulatory system consisting of a heart, arteries, veins, and capillaries.

43. 5-43 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Alcohol & Circulatory System Alcohol is absorbed from the stomach and small intestines into the blood stream. Alcohol is carried to the liver where the process of its destruction starts.

44. 5-44 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Alcohol & Circulatory System Blood, carrying alcohol, moves to the heart and is pumped to the lungs.

45. 5-45 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Alcohol & Circulatory System In the lungs, carbon dioxide and alcohol leave the blood and oxygen enters the blood in the air sacs known as alveoli. Then the carbon dioxide and alcohol are exhaled during breathing. This is the basis of the breathalyzer analysis where you exhale into an instrument that measures the amount of alcohol you have in your system.

46. 5-46 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Testing for Intoxication

47. 5-47 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 47 Rate of Absorption Depends on: Amount of alcohol consumed The alcohol content of the beverage Time taken to consume it Quantity and type of food present in the stomach Physiology of the consumer

48. 5-48 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 48 BAC: Blood Alcohol Content Expressed as percent weight per volume of blood Legal limit in all states is 0.08 percent Parameters influencing BAC: Body weight Alcohol content Number of beverages consumed Time since consumption

49. 5-49 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein BAC Calculation Male BAC = Female BAC = Burn-off rate of 0.015 percent per hour, but can vary: 0.071  (oz)  (% alcohol) body weight 0.085  (oz)  (% alcohol) body weight

50. 5-50 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 50 Field Tests Preliminary tests —used to determine the degree of suspect’s physical impairment and whether or not another test is justified Psychophysical tests —three basic tests: Horizontal gaze nystagmus (HGN): follow a pen or small flashlight, tracking left to right with one’s eyes. In general, wavering at 45 degrees indicates 0.10 BAC. Nine-step walk and turn (WAT): comprehend and execute two or more simple instructions at one time One-leg stand (OLS): maintain balance; comprehend and execute two or more simple instructions at one time

51. 5-51 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 51 The Breathalyzer More practical in the field Collects and measures alcohol content of alveolar breath Breath sample mixes with 3 ml of 0.025 percent K 2 Cr 2 O 7 in sulfuric acid and water: 2K 2 Cr 2 O 7 +3C 2 H 5 OH + 8H 2 SO 4  2Cr 2 (SO 4 ) 3 + 2K 2 SO 4 + 3CH 3 COOH + 11H 2 O Potassium dichromate is yellow; as concentration decreases, its light absorption diminishes, so the breathalyzer indirectly measures alcohol concentration by measuring light absorption of potassium dichromate before and after the reaction with alcohol.

52. 5-52 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein 52 Generalizations During absorption, the concentration of alcohol in arterial blood is higher than in venous blood. Breath tests reflect alcohol concentration in the pulmonary artery. The breathalyzer also can react with acetone (as found in diabetics), acetaldehyde, methanol, isopropyl alcohol, and paraldehyde, but these are toxic and their presence means the person is in serious medical condition. Breathalyzers now use an infrared light-absorption device with a digital readout. Prints out a card for a permanent record.

53. 5-53 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Breath Testers Breath testers that operate on the principle of infrared light absorption are becoming increasingly popular within the law enforcement community.

54. 5-54 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Breath Testers Many types of breath testers are designed to analyze a set volume of breath. The captured breath is exposed to infrared light.

55. 5-55 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Breath Testers It’s the degree of the interaction of the light with alcohol in the captured breath sample that allows the instrument to measure a blood alcohol concentration in breath. Some breath testing devices also use fuel cells.

56. 5-56 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Field Testing Law enforcement officers typically use field sobriety tests to estimate a motorist’s degree of physical impairment by alcohol and whether or not an evidential test for alcohol is justified. The horizontal gaze nystagmus test, walk and turn, and the one-leg stand are all considered reliable and effective psychophysical tests.

57. 5-57 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Field Testing A portable, handheld, roadside breath tester may be used to determine a preliminary breath-alcohol content.

58. 5-58 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Gas Chromatography Testing Gas chromatography offers the toxicologist the most widely used approach for determining alcohol levels in blood.

59. 5-59 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drunk Driver Kills Cyclist

60. 5-60 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drug Identification The challenge or difficulty of forensic drug identification comes in selecting analytical procedures that will ensure a specific identification of a drug. This plan, or scheme of analysis, is divided into two phases. –Screening test that is nonspecific and preliminary in nature to reduce the possibilities to a manageable number. –Confirmation test that is a single test that specifically identifies a substance.

61. 5-61 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Preliminary Analysis Faced with the prospect that the unknown substance may be any one of a thousand or more commonly encountered drugs, the analyst must employ screening tests to reduce these possibilities to a small and manageable number. This objective is often accomplished by subjecting the material to a series of color tests that will produce characteristic colors for the more commonly encountered illicit drugs.

62. 5-62 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Liquid Drug Analysis

63. 5-63 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Liquid Drug Analysis

64. 5-64 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Liquid Drug Analysis Mr. Puckett as a Clinical Chemistry Instructor for Olympus Medical Instruments These analyzers detect drugs in blood and urine.

65. 5-65 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Preliminary Analysis Microcrystalline tests can also be used to identify specific drug substances by studying the size and shape of crystals formed when the drug is mixed with specific reagents.

66. 5-66 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Confirmational Determination Once this preliminary analysis is completed, a confirmational determination is pursued. Forensic chemists will employ a specific test to identify a drug substance to the exclusion of all other known chemical substances. Typically infrared spectrophotometry or gas chromatography-mass spectrometry is used to specifically identify a drug substance.

67. 5-67 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Mass Spectroscopy

68. 5-68 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Infrared Spectroscopy

69. 5-69 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Qualitative vs. Quantitative Another consideration in selecting an analytical technique is the need for either a qualitative or a quantitative determination. The former relates just to the identity of the material, whereas the latter requires the determination of the percent composition of the components of a mixture.

70. 5-70 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Chromatography Chromatography is a means of separating and tentatively identifying the components of a mixture.

71. 5-71 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Chromatography The theory of chromatography is based on the observation that chemical substances have a tendency to partially escape into the surrounding environment when dissolved in a liquid or when absorbed on a solid surface. Those materials that have a preference for the moving phase will slowly pull ahead and separate from those substances that prefer to remain in the stationary phase.

72. 5-72 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein TLC TLC uses a solid stationary phase usually coated onto a glass plate and a mobile liquid phase to separate the components of the mixture.

73. 5-73 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein TLC The liquid will slowly rise up the plate by capillary action causing the sample to become distributed between the stationary phase and the moving liquid phase. Because most compounds are colorless, the materials must be visualized by placing the plates under ultraviolet light or spraying the plate with a chemical reagent. The distance a spot travels up a thin-layer plate can be assigned a numerical value known as the R f value.

74. 5-74 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Gas Chromatography In GC, the moving phase is actually a gas called the carrier gas, which flows through a column.

75. 5-75 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Gas Chromatography The stationary phase is a thin film of liquid contained within the column. After a mixture has traversed the length of the column, it will emerge separated into its components.

76. 5-76 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Gas Chromatography The written record of this separation is called a chromatogram. The time required for a component to emerge from a GC column is known as retention time.

77. 5-77 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Spectrohotometry Just as a substance can absorb visible light to produce color, many of the invisible radiations of the electromagnetic spectrum are likewise absorbed. Spectrophotometry, an important analytical tool, measures the quantity of radiation that a particular material absorbs as a function of wavelength and frequency. The quantity of light absorbed at any frequency is directly proportional to the concentration of the absorbing species. This is known as Beer’s Law.

78. 5-78 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein UVand IR Spectrophotometry Currently, most forensic laboratories use UV and IR spectrophotometers to characterize chemical compounds. The simplicity of the UV spectrum facilitates its use as a tool for determining a material’s probable identity, although it may not provide a definitive result. The IR spectrum provides a far more complex pattern.

79. 5-79 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein UVand IR Spectrophotometry Different materials always have distinctively different infrared spectra; each IR spectrum is therefore equivalent to a “fingerprint” of that substance.

80. 5-80 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein The Spectrophotometer The spectrophotometer is the instrument used to measure and record the absorption spectrum of a chemical substance. The components of a spectrophotometer are: –A radiation source –A monochromator or frequency selector –A sample holder –A detector to convert electromagnetic radiation into an electrical signal –A recorder to produce a record of the signal Absorption spectra can be done in the visible, ultraviolet (UV) or infrared (IR) regions.

81. 5-81 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Mass Spectrometry In the mass spectrometer, a beam of high-energy electrons collide with a material, producing positively charged ions.

82. 5-82 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Mass Spectrometry These positive ions almost instantaneously decompose into numerous fragments, which are separated according to their masses. The unique feature of mass spectrometry is that under carefully controlled conditions, no two substances produce the same fragmentation pattern.

83. 5-83 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein GC and Mass A direct connection between the GC column and the mass spectrometer allows each component to flow into the mass spectrometer as it emerges from the GC.

84. 5-84 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein GC and Mass The separation of a mixture’s components is first accomplished by the GC. Then, fragmentation of each component by high-energy electrons in the mass spectrometer, will produce a distinct pattern, somewhat like a “fingerprint”, of the substance being examined.

85. 5-85 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein GC and Mass

86. 5-86 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Collection and Preservation The field investigator has the responsibility of ensuring that the evidence is properly packaged and labeled for the laboratory. Generally common sense is the best guide, keeping in mind that the package must prevent the loss of the contents and/or cross- contamination.

87. 5-87 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Collection and Preservation Often the original container in which the drug was seized will suffice. All packages must be marked with information that is sufficient to ensure identification by the officer in the future and establish the chain of custody.

88. 5-88 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drugs and Crime More than half of all the people arrested in the United States test positive for illegal drugs. Drug addiction can lead to increased property crime and robberies. Drug and alcohol abuse contribute to higher rates of domestic violence, child abuse and sexual violence. (National Institute of Justice, U.S. Department of Justice, 2007).

89. 5-89 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drugs and Crime Drug use is more closely linked to robbery and property crime than to violent crime. Many addicts commit crimes to get money to buy drugs. In state prisons, those convicted of violent crimes are less likely to have used drugs than those convicted of property crimes. Yet at least a quarter of men who commit acts of domestic violence also have drug abuse problems. Woman who are drug addicts are more likely to be victims of abuse. (Ibid.)

90. 5-90 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drugs and Crime In the 2004 Survey of Inmates in State and Federal Correction Facilities, 32% of State prisoners and 26% of Federal prisoners said they had committed their current offense while under the influence of drugs. Among State prisoners, drug offenders (44%) and property offenders (39%) reported the highest incidence of drug use at the time of the offense. Among Federal prisoners, drug offenders (32%) and violent offenders (24%) were the most likely to report drug use at the time of their crimes. (Department of Justice, Office of Justice Programs, 2006). In 2004, 17% of State prisoners and 18% of Federal inmates said they committed their current offense to obtain money for drugs. (Ibid.)

91. 5-91 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drugs and Crime In 1998, Americans spent $66 billion on illegal drugs, with $39 billion being spent by consumers on cocaine (Office of National Drug Control Policy, 2000). In 1999, the Federal Bureau of Investigation reported an estimated 1,577,100 arrests for drug abuse violations in the United Sates (Federal Bureau of Investigation, 2000).

92. 5-92 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ 07458 FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Drugs and Crime Attempts to deter drug use through punishment fail because they do not address the complex causes of drug abuse, which begins within the context of family problems and peer deviant behavior. One characteristic necessary for successful programs is continuing, comprehensive aftercare in the community. This reduces the chances that someone will be arrested and convicted again (National Institute of Justice, 2008).