CFI Fire Investigation Reporting & Documentation 3 — Questions and Answers
Question 1: When an investigator uses the term 'undetermined' as the cause of fire, it means:
- The investigator was negligent in gathering evidence
- A fire cause cannot be proven to the exclusion of all others with available evidence (Correct answer)
- The fire was intentionally set but cannot be proven
- The investigation is incomplete and will be resumed
Correct answer: A fire cause cannot be proven to the exclusion of all others with available evidence
An 'undetermined' cause classification is appropriate and scientifically valid when the available evidence does not support a specific cause to a reasonable degree of certainty.
Question 2: Which of the following is an example of a 'competent ignition source' that must be documented in a fire report?
- A cold water pipe near the origin
- A malfunctioning electrical outlet with sufficient heat energy to ignite nearby fuel (Correct answer)
- A damp cloth on the floor
- A closed refrigerator door
Correct answer: A malfunctioning electrical outlet with sufficient heat energy to ignite nearby fuel
A competent ignition source must have sufficient energy to raise a fuel to its ignition temperature; a malfunctioning outlet can generate arcing heat meeting this threshold.
Question 3: In a fire investigation report, the 'origin' is defined as:
- The room where the most damage occurred
- The general location or precise point where a fire began (Correct answer)
- The first room reached by firefighters
- The location of the electrical panel
Correct answer: The general location or precise point where a fire began
The origin is the general location or specific point where combustion first started, which may or may not be the area of greatest damage.
Question 4: What is the purpose of including a timeline in a fire investigation report?
- To demonstrate the investigator's thoroughness
- To establish chronological sequence of events that led to and followed the fire (Correct answer)
- To satisfy insurance company requirements
- To identify all potential witnesses
Correct answer: To establish chronological sequence of events that led to and followed the fire
A timeline establishes the chronological sequence of relevant events, helping correlate witness accounts, alarm activations, and fire development to support cause and origin conclusions.
Question 5: When documenting electrical evidence in a fire report, which finding would support an electrical cause hypothesis?
- Char patterns that follow a V-shape
- Beaded copper conductors found at the origin with primary melting characteristics (Correct answer)
- Smoke deposits on windows above the neutral plane
- Alligatoring char patterns on wood surfaces
Correct answer: Beaded copper conductors found at the origin with primary melting characteristics
Beaded copper conductors with primary melting characteristics (rounded, smooth beads) indicate electrical arcing occurred before the fire, supporting an electrical ignition hypothesis.
Question 6: An investigator preparing a report for criminal prosecution should ensure the report:
- Uses technical jargon to demonstrate expertise
- Is written in clear language that a layperson juror can understand (Correct answer)
- Omits alternative hypotheses considered
- Focuses only on physical evidence and excludes witness statements
Correct answer: Is written in clear language that a layperson juror can understand
Reports intended for criminal prosecution must be written in clear, accessible language so jurors without technical backgrounds can understand and evaluate the investigator's conclusions.
Question 7: What information should be included in the 'scene description' section of a fire investigation report?
- Only the investigator's conclusions about the origin
- The building's construction type, occupancy, utilities, and overall fire damage description (Correct answer)
- Financial loss estimates only
- Names and statements of all witnesses interviewed
Correct answer: The building's construction type, occupancy, utilities, and overall fire damage description
The scene description section documents objective physical characteristics including construction type, occupancy classification, utility systems, and the extent and nature of fire damage observed.
CFI Fire Investigation Reporting & Documentation 3
When an investigator uses the term 'undetermined' as the cause of fire, it means: