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9.4 Notes ID, Collection of Evidence. Objectives  Describe the laboratory tests normally used to perform a routine drug identification analysis  Understand.

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Presentation on theme: "9.4 Notes ID, Collection of Evidence. Objectives  Describe the laboratory tests normally used to perform a routine drug identification analysis  Understand."— Presentation transcript:

1 9.4 Notes ID, Collection of Evidence

2 Objectives  Describe the laboratory tests normally used to perform a routine drug identification analysis  Understand proper collection and preservation of drug evidence

3 Drug Identification  Either a specimen is a specific drug or it is not  Chemists must be prepared to support and defend the validity of the results in a court of law Screening test – reduces possibilities  first test is color test Confirmation test - pinpointing

4 Drug Identification cont. The procedures must be able to confirm that the likelihood of any other substance responding in an identical manner to a certain drug is so minimal that there exists no other conclusion but reasonable scientific certainty

5 Analytical schemes 1. Color tests 2. Microcrystalline tests 3. Chromatography 4. Spectrophotometry 5. Mass Spectrometry

6 Color Tests 1. Marquis reagent – purple with heroine and morphine; orange with amphetamines 2. Dillie-Koppanyi – violet blue with barbiturates 3. Duquenois-Levine – ABC layers with layer C purple with marijuana 4. Van Urk – purple/blue with LSD 5. Scott Test – ABC (A with cocaine, blue to pink in B, and blue again in C layer)

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8 Microcrystalline Tests  Chemical reagent added to drug on slide  Crystalline precipitate with unique structures results

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10 Chromatography  Uses TLC (Thin Layer Chromatography) and gas  Requires the R f comparison of known and questioned drugs  Accompanies color and crystal test

11 Spectrophotometry  Absorption of light in the UV and IR regions of the spectrum  Establishes probable drug  IR can specifically ID a substance

12 Mass Spectrometry  GC/MS  Utilizes the fragmentation pattern of sample molecules which serves as a fingerprint  Can be used to separate components of a complex drug mix

13 ID of Marijuana  Based on botanical features  Cystolithic hairs – short hairs, shaped like bear claws  DuQuenois-Levine color test  Without leaf, TLC is used

14 Collection & Preservation of Drug Evidence  Original container  Airtight container if glue sniffing  Packages marked  Background information


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