Trailer Evidence
Definition
A physical pathway of combustible material laid between two ignition areas in a structure arson to allow a single ignition act to start multiple fires at separate locations; burns during the fire and may survive only as a narrow linear char.
- Nature
- Combustible material pathway
- Function
- Links two separate ignition points
- Context
- Structure arson with multiple origins
- Post-fire form
- Often survives only as a narrow linear char
Common questions
Why is trailer evidence significant for proving intent in an arson case?+
A trailer deliberately connecting two separate ignition points is difficult to explain as accidental, since accidental fires do not create combustible pathways engineered to spread ignition between locations.
What can destroy trailer evidence before an investigator finds it?+
The trailer material itself typically burns away during the fire, so investigators must rely on the narrow linear char pattern it leaves in flooring or debris rather than the original material.
Related terms
- Cal Fire Law Enforcement and Investigations Division
- The specialist investigative division of the California Department of Forestry and Fire Protection responsible for wildfire origin-and-cause investigation, with peace-officer powers, across...
- Devil's Eye Burn Pattern
- The almond-shaped fire perimeter produced by a wind-driven wildfire, with the ignition point (heel) at the narrow end and the fire head...
- Heel of a Fire
- The narrow, closed end of a wind-driven wildfire's elliptical burn perimeter, closest to the ignition point; the investigator works from the outer...
- Ignition-Point Clustering Analysis
- A spatial statistical analysis applied to a series of suspected wildfire arson incidents, examining whether the geographic distribution of identified ignition points...
- Multiple Origin Areas
- Two or more separate, unconnected zones of fire origin in a structure, each with independent burning evidence; the strongest physical indicator of...
- Negative-Corpus Argument
- An invalid standalone conclusion in fire investigation that a fire was incendiary because no accidental cause was identified; rejected by NFPA 921...
- Pour Pattern
- A burn-through pattern in floor material or seat fabric produced by a liquid accelerant poured on the surface before ignition; produces a...
- Time-of-Day Analysis
- A statistical tool in wildfire arson investigation that compares the time-of-report distribution for suspected arson fires against confirmed accidental fires in the...
- Undetermined Cause
- The correct fire cause classification when a fire investigator cannot identify a specific accidental cause but also has no positive physical evidence...