Presentation on theme: "Pathology Medical Examiner Mr.McNiff CHS Forensics."— Presentation transcript:
Pathology Medical Examiner Mr.McNiff CHS Forensics
Who are Medical Examiners A doctor who performs an autopsy when someone dies an accidental or violent death. They determine the cause of death as well as time of death.
forensic pathologist A forensic pathologist is a physician who has received special training in pathology and forensic pathology. Their training takes approximately six years after graduating from medical school.
Medical Examiner vs. Coroner A medical examiner is always a medical doctor whereas it is not necessary for a coroner to be a medical doctor. A medical examiner is appointed while a coroner is usually elected.
Medical Examiner vs. Coroner A medical examiner gives objective information on the circumstances of a victim’s death. A coroner must give subjective opinions based on evidence found surrounding a victim and their death. Coroners usually have legal powers such as subpoena powers.
Classification In a forensic autopsy, death is placed into five different categories. Natural Accident Homicide Suicide Unknown
Natural Death Death by natural cause is a term used by coroners to describe the death of someone by occurring disease process, or is not apparent given medical history or circumstances. The majority of natural death is caused by old age. Other causes of natural death are heart disease, stroke, gentic disorders, etc.
Accidental Death Accidental death is a death that is often caused by mistake or in a freak occurrence. Deaths are not planned yet can be explained by surrounding circumstances.
Homicidal Death The term ‘homicide’ refers to the act of killing another person. There are different types of homicide. InfanticideInfanticide - Killing of an infant FratricideFratricide - Killing of one's brother; in a military context, killing of a friendly combatant SororicideSororicide - Killing of one's sister ParricideParricide - Killing of one's parents PatricidePatricide - Killing of one's father
Homicidal Death MariticideMariticide - Killing of one's spouse UxoricideUxoricide - Killing of one's wife FilicideFilicide - Killing of one's child RegicideRegicide - Killing of a monarch.monarch GenocideGenocide - Killing of a national, ethnic, racial or religious group Homicide is often the most investigated death, therefore making it the most autopsied.
Suicidal Death The act of ending ones own life. These autopsies often easily identify source, cause, and other factors of the death. Suicide is often identified in the forensic autopsy as a cause of toxic, firearms, blunt force trauma, etc.
Unknown Death In some jurisdictions, the Undetermined category may include deaths in absentia, such as deaths at sea and missing persons declared dead in a court of law; in others, such deaths are classified under "Other“.
laws Although State laws vary in specific requirements, deaths that typically require investigation are those due to unusual or suspicious circumstances, violence (accident, suicide, or homicide), those due to natural disease processes when the death occurred suddenly and without warning.
Medical Examiner Human remains are treated as a separate and unique type of forensic evidence. An autopsy of the remains is completed to determine the cause and manner of any death that is violent, unusual or untimely.
Medical Examiner A forensic pathologist will examine the human remains (post-mortem examination) and consider death scene findings. The medical history of the individual may also be reviewed to help determine if the death was natural, accidental or criminal.
External Investigation The body must be measured and weighed and placed on an autopsy table prior to making the Y-cut. A general description of the body is made before any further examinations are done. All identifying features are noted including: Race Sex Hair color and length
External Investigation identifying features cont. Eye color Approximate age Any identifying features (scars, tattoos, birthmarks, etc.) Any wounds inflicted on the outside of the body (burns, ligature marks, stab wounds, bullet wounds) Photograph the body
Identification of the deceased If the Identity of the deceased is unknown then the M.E. needs to ID the body. The condition of the body due to scavengers or decomposition can make a visual ID impossible.
Identification of the deceased Three common methods used to ID a unknown victim: DNA (from tissue or bone) Dental records Fingerprints due to decomposition some fingers need to injected with liquid to make the print usable.
Internal Investigation The body is opened using a Y-shaped incision from shoulders to mid- chest and down to the pubic region.
Internal Investigation If the head is to be opened, the pathologist makes a second incision across the head, joining the bony prominences just below and behind the ears.
Types of Evidence Injuries: Describe injuries Location Type –Blunt force –Laceration –Cut –Gun shot Severity Distinguishing markings
Mechanical asphyxiation including strangulation, can be marked by the appearance of petechial hemorrhages on the conjunctiva, as shown here.
Mechanical asphyxia Finding ligature marks on the neck, hyoid bone fracture, and/or soft tissue hemorrhages in neck and larynx may help to determine the mechanism of injury.
Hanging Inspect the knot Type / How tied Running/fixed Point of suspension How affixed Distance from ground/floor Evidence of previous suspensions Autoerotic Position of body Livor mortis Platform
Stabbing Wounds Location of wounds Defense wounds Attempt to determine the type of weapon used Injury patterns Blood spatter patterns Location of initial injury versus location of body blood stains in a separate area from the location of the body
Gunshot wound Location of wounds Type of wound Powder marks, stippling Weapon Caliber Ownership Secondary impact points if the bullet exited the body Directionality consistent with the known details
Falls Reason for the fall Intentional (suicide) Slip (accidental) Pushed (homicide) Details of fall Point from which the decedent fell Distance to point of impact Vertically from point of elevation
Blunt force trauma How injuries may have occurred Injuries and injury patterns Consistent with any surrounding objects Object at the scene that may have caused the injuries
Drug related Drugs or paraphernalia Location in reference to death scene Possible type of drugs involved Collection and preservation Evidence on the body that may indicate drug use Injection sites Indications of inhalation, or huffing
Exsanguination Exsanguination is the extensive loss of blood due to internal or external hemorrhage.
Refrences Thompson, Darrell. "Forensic Death Scene Investigation." Tarrant County. Web. Rahman, Mahmuda. "The Medical Examiner/ Forensic Pathologist." Web. Kacher, Emie. "A Day in the Life of a Forensic Pathology.“ USA. CDC. Department of Health and Human Services. Medical Examiners and Coroners Handbook on Death Registration and Fetal Death Reporting. By Donna L. Hoyert, Ph.D and Arialdi M. Minino. Edition ed. Vol Print