CFI Origin & Cause Determination 3

Question 1

What role does 'fuel load' play in interpreting fire patterns during origin determination?

Accepted Answer

Heavy fuel loads can create intense localized burning that may be mistaken for an accelerated fire or secondary origin

Answer

Concentrated fuel loads can produce intense, localized burning patterns that may resemble accelerant use or multiple origins, requiring investigators to account for fuel distribution when interpreting patterns.

Question 2

Which of the following best describes the 'scientific method' as applied to fire investigation?

Accepted Answer

A systematic process of recognizing a problem, collecting data, forming hypotheses, testing them, and reaching conclusions

Answer

The scientific method applied to fire investigation involves recognizing the problem, defining it, collecting data, analyzing the data, developing hypotheses, testing those hypotheses, and selecting the final hypothesis.

Question 3

A post-fire examination reveals that a circuit breaker serving a particular circuit has tripped. What conclusion should the investigator draw from this finding alone?

Accepted Answer

The circuit experienced an overload or fault, but this could be the cause or a result of the fire

Answer

A tripped breaker indicates the circuit experienced an overload or fault, but this can result from fire damage to wiring (fire as cause) or from an electrical failure that started the fire—further analysis is required.

Question 4

In NFPA 921 methodology, what is the difference between 'eliminating' and 'excluding' a hypothesis?

Accepted Answer

A hypothesis is eliminated when physically impossible; it is excluded when the evidence is merely inconsistent with it

Answer

NFPA 921 distinguishes that a hypothesis should only be eliminated if it is physically impossible; otherwise, inconsistent evidence may exclude it from consideration without full elimination.

Question 5

What is 'alligatoring' in the context of fire investigation, and what is its investigative significance?

Accepted Answer

A pattern of large, shiny blisters on charred wood that was once believed to indicate accelerant use but is now understood to reflect burning conditions

Answer

Alligatoring refers to the scaly, blistered charring pattern on wood; research has shown it reflects heat intensity and duration, not accelerant use, and should not be used as a sole indicator of arson.

(CFI) Certified Fire Investigator Practice Test

(CFI) Certified Fire Investigator Practice Test

CFI Origin & Cause Determination 3