How do investigators typically identify the use of an accelerant?

Investigators typically identify the use of an accelerant by conducting chemical analysis of residues found at a fire scene. This method involves collecting samples from the area where the fire originated and analyzing them in a laboratory to detect any flammable substances that may have been used to ignite or spread the fire. Accelerants are often hydrocarbons, such as gasoline or lighter fluid, which leave identifiable chemical residues.

Chemical analyses provide concrete evidence that can confirm the presence of specific substances, allowing investigators to distinguish between accidental fires and those that are intentionally set. While eyewitness accounts, fire damage assessments, and interviews can provide contextual information or clues, they do not offer the same level of scientific validation as chemical analysis. Thus, the reliance on physical evidence through chemical testing is a crucial step in determining arson.