CSI Forensic Death Investigation 3 — Questions and Answers
Question 1: A body is found with ligature marks showing 'parchment-ization' of the skin. What does this indicate?
- The ligature was applied post-mortem
- The ligature was applied ante-mortem and the victim survived briefly (Correct answer)
- Decomposition has reached an advanced stage
- The victim was dragged across a rough surface
Correct answer: The ligature was applied ante-mortem and the victim survived briefly
Parchment-ization (drying and browning of the skin at a ligature mark) indicates the ligature was applied while the victim was alive and the wound began to dry before death was complete.
Question 2: What is the significance of 'hesitation wounds' in a forensic death investigation?
- They indicate a struggle with an assailant
- They suggest a self-inflicted injury, often seen in suicides (Correct answer)
- They are caused by a serrated blade during homicide
- They represent defensive wounds on the forearms
Correct answer: They suggest a self-inflicted injury, often seen in suicides
Hesitation wounds are shallow, tentative incised wounds typically grouped near a more fatal wound, strongly suggesting self-infliction and often seen in suicide by sharp instrument.
Question 3: During scene investigation, you observe 'petechial hemorrhaging' in the conjunctiva of the eyes. This finding is most consistent with which manner of death?
- Poisoning by carbon monoxide
- Compression asphyxia or manual strangulation (Correct answer)
- Blunt force head trauma
- Drowning in cold water
Correct answer: Compression asphyxia or manual strangulation
Conjunctival petechiae result from rupture of small capillaries due to increased venous pressure, which is characteristic of asphyxial deaths including strangulation and compression.
Question 4: Which toxicological specimen is preferred for detecting drugs that may be redistributed post-mortem in central blood?
- Femoral (peripheral) blood (Correct answer)
- Cardiac blood
- Vitreous humor
- Liver tissue
Correct answer: Femoral (peripheral) blood
Femoral (peripheral) blood is preferred over cardiac blood because drugs tend to redistribute from organs into the heart after death, artificially elevating central blood concentrations.
Question 5: What does a 'stippling' pattern around a gunshot wound entry indicate?
- The weapon was in direct contact with skin (contact wound)
- The muzzle was 6-18 inches from the skin at time of discharge (Correct answer)
- The victim was shot from a distance greater than 3 feet
- The bullet fragmented upon entry
Correct answer: The muzzle was 6-18 inches from the skin at time of discharge
Stippling (tattooing) is caused by unburned powder particles embedded in the skin when the muzzle is within intermediate range, generally 6 to 18 inches from the skin surface.
Question 6: What is 'saponification' in the context of decomposed remains?
- Mummification of soft tissue due to hot, dry conditions
- Conversion of body fat into a waxy, soap-like substance (adipocere) (Correct answer)
- Petrification of bone tissue over centuries
- Liquefaction of internal organs during putrefaction
Correct answer: Conversion of body fat into a waxy, soap-like substance (adipocere)
Saponification (adipocere formation) occurs when body fat undergoes hydrolysis and hydrogenation in moist, anaerobic conditions, producing a white, waxy substance that can preserve body shape.
Question 7: A decedent is found with cherry-red lividity. Which toxic substance is most likely responsible?
- Cyanide poisoning
- Carbon monoxide poisoning (Correct answer)
- Opioid overdose
- Alcohol intoxication
Correct answer: Carbon monoxide poisoning
Carbon monoxide binds to hemoglobin forming carboxyhemoglobin, which imparts a bright cherry-red or pink color to the blood and skin, including lividity.
CSI Forensic Death Investigation 3
A body is found with ligature marks showing 'parchment-ization' of the skin.
What does this indicate?