NAFI CFEI PRACTICE SOLUTION 2026
STUDY GUIDE BUNDLED
⩥Electrical arcing. Answer: Evidence of fire origin.
⩥Correct order of evidence handling. Answer: Collect, package, label,
document.
⩥Fire tetrahedron component. Answer: Not including Light.
⩥Backdraft. Answer: Occurs when oxygen is introduced into an oxygen-
depleted environment.
⩥Bias in fire investigation. Answer: Must be avoided by a fire
investigator.
⩥First step in the scientific method. Answer: Form a hypothesis.
⩥Tool for evaluating circuit integrity. Answer: Multimeter.
⩥High-order explosions. Answer: Result in large craters and extensive
fragmentation.
, ⩥V-patterns. Answer: Always point to the point of origin.
⩥Chain of custody. Answer: Essential for evidence integrity.
⩥Recommended method for fire investigation according to NFPA 921.
Answer: Scientific method.
⩥Opinions in court. Answer: A fire investigator cannot offer opinions
outside their area of expertise.
⩥Factors affecting fire pattern appearance. Answer: Ventilation, Material
type, Suppression efforts, All of the above.
⩥NFPA 921 requirement. Answer: Requires fire investigators to be
licensed engineers.
⩥Digital photographs. Answer: Can be altered and are not admissible in
court.
⩥Cause of an explosion. Answer: Not typically a cause.
⩥Mechanical failure. Answer: A failure in machinery that can lead to
accidents or incidents.
STUDY GUIDE BUNDLED
⩥Electrical arcing. Answer: Evidence of fire origin.
⩥Correct order of evidence handling. Answer: Collect, package, label,
document.
⩥Fire tetrahedron component. Answer: Not including Light.
⩥Backdraft. Answer: Occurs when oxygen is introduced into an oxygen-
depleted environment.
⩥Bias in fire investigation. Answer: Must be avoided by a fire
investigator.
⩥First step in the scientific method. Answer: Form a hypothesis.
⩥Tool for evaluating circuit integrity. Answer: Multimeter.
⩥High-order explosions. Answer: Result in large craters and extensive
fragmentation.
, ⩥V-patterns. Answer: Always point to the point of origin.
⩥Chain of custody. Answer: Essential for evidence integrity.
⩥Recommended method for fire investigation according to NFPA 921.
Answer: Scientific method.
⩥Opinions in court. Answer: A fire investigator cannot offer opinions
outside their area of expertise.
⩥Factors affecting fire pattern appearance. Answer: Ventilation, Material
type, Suppression efforts, All of the above.
⩥NFPA 921 requirement. Answer: Requires fire investigators to be
licensed engineers.
⩥Digital photographs. Answer: Can be altered and are not admissible in
court.
⩥Cause of an explosion. Answer: Not typically a cause.
⩥Mechanical failure. Answer: A failure in machinery that can lead to
accidents or incidents.
