CFC Crime Scene Reconstruction 4

Question 1

What is the significance of 'impact angle' in bloodstain pattern analysis?

Accepted Answer

It allows calculation of the height and distance of the blood source from the stain

Answer

The impact angle, derived from the stain's width-to-length ratio using the inverse sine, is used to calculate the area of origin by geometric back-projection.

Question 2

During reconstruction, a forensic consultant determines that a decedent's body was moved post-mortem. Which evidence type is most conclusive for this determination?

Accepted Answer

Livor mortis pattern inconsistent with the body's final position

Answer

Livor mortis (lividity) fixes in the lowest body areas within 8-12 hours; if the fixed lividity pattern does not match the body's discovered position, post-mortem relocation is indicated.

Question 3

In arson investigation reconstruction, what does 'pour patterns' evidence suggest?

Accepted Answer

An accelerant was poured on the floor in a targeted pattern to direct fire spread

Answer

Pour patterns are irregular-shaped burn areas on floors resulting from liquid accelerant distribution, often showing sharp demarcation lines where the accelerant stopped.

Question 4

What does 'back spatter' (blowback) in a gunshot wound indicate about the shooter's position?

Accepted Answer

The shooter was at close range in front of the entry wound, as blowback projects toward the muzzle

Answer

Back spatter is blood and tissue ejected back through the entry wound toward the muzzle, indicating the shooter was in the direction from which the shot came and was likely within close range.

Question 5

A reconstruction expert is analyzing a scene where the body shows wounds inconsistent with the alleged suicide scenario. Which finding most strongly suggests homicide staged as suicide?

Accepted Answer

Contact gunshot wound on the non-dominant hand with the weapon found across the room

Answer

A contact wound (indicating close-range shot) on the non-dominant hand combined with the weapon being out of reach is physically inconsistent with self-infliction.

(CFC) Certified Forensic Consultant Practice Test

(CFC) Certified Forensic Consultant Practice Test

CFC Crime Scene Reconstruction 4