>However, isn’t the cigarette already long gone after the house/forrest/etc. has burnt down?
Interviews help. Talk to their friends and family members. “Yeah, Joe would get shitfaced every Saturday night and fall asleep with a cigarette in his mouth. Once he lit my couch on fire but I put it out.”
Combine with any evidence left or other interviews and you can often build a picture of things.
Also in most urban and suburban areas fire departments tend to be fairly close so if they get called to a fire the places rarely fully burn down and some evidence is preserved.
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