What are the basic steps involved in a fire investigation?

• A. Secure scene, identify ignition sources, collect samples and evidence (accelerants), document burn patterns, and determine cause.
• B. Closely examine the crime scene for jewelry.
• C. Immediately seize the suspect's home.
• D. Ignore accelerants when present.

Answer: (A)

The main idea is to approach a fire scene in a way that preserves evidence, focuses on where the fire started, gathers lab-ready samples, and uses what is found to determine the cause. First, securing the scene is crucial because it prevents contamination and preserves the chain of custody, ensuring any findings are credible in court. Next, identifying ignition sources helps pinpoint where the fire began and what could have ignited it, whether electrical equipment, matches, a heater, or an arson device. Collecting samples and evidence, including debris for accelerant analysis and relevant electrical components, provides the data labs need to confirm or rule out the presence of accelerants and to support origin determination. Documenting burn patterns through photos, notes, and sketches reveals the origin and the direction and speed of spread, which are key to reconstructing how the fire propagated. Finally, determining the cause brings together all findings, testing hypotheses, and distinguishing between accidental, natural, or intentional causes to reach a defensible conclusion.

Other choices don’t fit because they don’t address the fire scene’s investigative priorities. Focusing on jewelry adds irrelevant details that don’t help locate the origin or cause. Seizing a suspect’s home immediately steps outside standard fire-scene procedures and raises legal and practical issues without advancing the investigation. Ignoring accelerants would omit critical evidence if arson is a possibility, undermining the accuracy of the determination.