CFC Crime Scene Reconstruction 2 — Questions and Answers
Question 1: In crime scene reconstruction, what does 'Locard's Exchange Principle' specifically state?
- Every contact leaves a trace between two surfaces (Correct answer)
- Physical evidence is always visible to the naked eye
- Blood spatter patterns reveal shooter position exclusively
- Fingerprints are the most reliable form of trace evidence
Correct answer: Every contact leaves a trace between two surfaces
Locard's Exchange Principle holds that whenever two objects come into contact, material is transferred between them, forming the foundation of trace evidence analysis.
Question 2: A reconstructionist finds a bullet entry wound on the victim's back with an exit wound on the front. What does this indicate about the shooter's position?
- The shooter was behind the victim (Correct answer)
- The shooter was in front of the victim
- The shooter was above the victim
- The shooter was to the left of the victim
Correct answer: The shooter was behind the victim
Bullets travel from entry to exit wound, so a posterior entry with anterior exit indicates the shot came from behind the victim.
Question 3: Which method is used to determine the area of origin of blood spatter in 3D space?
- Stringing method connecting individual stain trajectories (Correct answer)
- Gas chromatography of blood samples
- Luminol spray pattern analysis
- DNA phenotyping of blood stains
Correct answer: Stringing method connecting individual stain trajectories
The stringing method uses the directionality and impact angles of individual bloodstains to triangulate the three-dimensional origin point of the spatter event.
Question 4: What does a 'transfer bloodstain' indicate at a crime scene?
- Blood was moved from a bloody surface to a secondary surface by contact (Correct answer)
- Blood dripped straight down due to gravity
- Blood was projected through the air with force
- Blood pooled beneath a stationary body
Correct answer: Blood was moved from a bloody surface to a secondary surface by contact
Transfer stains result from direct contact between a bloody object and a secondary surface, potentially revealing the shape of the object that caused the transfer.
Question 5: In shooting incident reconstruction, what is the primary purpose of trajectory rods?
- To establish the bullet's path through space and identify the shooter's location (Correct answer)
- To measure the caliber of the projectile used
- To detect gunshot residue on surfaces
- To determine the time elapsed since the shot was fired
Correct answer: To establish the bullet's path through space and identify the shooter's location
Trajectory rods are inserted through bullet holes to visually represent the bullet's flight path, allowing reconstructionists to back-project to the shooter's probable position.
Question 6: What characteristic distinguishes a 'void pattern' in blood spatter analysis?
- An absence of bloodstains in an area that should logically have received spatter (Correct answer)
- An unusually dense concentration of blood droplets
- A circular pattern indicating low-velocity impact
- A linear pattern caused by a swinging object
Correct answer: An absence of bloodstains in an area that should logically have received spatter
A void pattern is the absence of expected bloodstains, indicating that an object or person was present during the bloodshed event and blocked the spatter.
Question 7: During crime scene reconstruction, 'event sequencing' is best accomplished by:
- Analyzing physical evidence interactions to determine which events preceded others (Correct answer)
- Interviewing witnesses in chronological order
- Reviewing surveillance footage timestamps exclusively
- Mapping the scene grid by grid from entry to exit
Correct answer: Analyzing physical evidence interactions to determine which events preceded others
Event sequencing uses physical evidence relationships—such as which bloodstains overlay others or which damage patterns predate others—to establish the chronological order of events.
CFC Crime Scene Reconstruction 2
In crime scene reconstruction, what does 'Locard's Exchange Principle' specifically state?