CFI Fire Scene Management 3

Question 1

Under NFPA 921, what is the recommended approach when two valid hypotheses exist for the cause of a fire?

Accepted Answer

Test each hypothesis against all available data and eliminate those not supported

Answer

NFPA 921 directs investigators to apply the scientific method, testing each hypothesis against all data and eliminating those that cannot be supported by the evidence.

Question 2

What is the primary hazard investigators face when re-entering a fire-damaged structure?

Accepted Answer

Structural collapse of compromised walls, floors, and roofs

Answer

Structural collapse is the leading cause of injury and death to investigators working in fire-damaged buildings.

Question 3

Which type of evidence collection container is preferred for liquid accelerant samples?

Accepted Answer

New, unused paint cans with tight-fitting lids or approved nylon bags

Answer

New, unlined paint cans or approved nylon/polyester evidence bags are preferred because they do not off-gas or contaminate accelerant samples the way plastic or rubber materials can.

Question 4

A fire investigator is called to a scene three days after suppression. What is the first step before beginning examination?

Accepted Answer

Obtain proper legal authority to enter and search the scene

Answer

Before any physical examination, investigators must ensure they have proper legal authority—consent, administrative warrant, or criminal warrant—to enter and search the scene.

Question 5

What does 'low burn' evidence at a fire scene typically indicate to an investigator?

Accepted Answer

A flammable liquid may have been used and pooled on the floor

Answer

Low burn patterns on floors and lower wall surfaces can indicate the presence of flammable liquids, which pool and ignite at floor level.

(CFI) Certified Fire Investigator Practice Test

(CFI) Certified Fire Investigator Practice Test

CFI Fire Scene Management 3