Frankly, it is part of an adjusters job to determine the cause of a loss for which a claim is submitted.
An adjuster may rely upon the determindation, if any, made by the public auhority (fire department incident commander, investigator, etc.), hire an independent expert, or if he/she is qualified as an expert in their own right conduct his/her own investigation.
I have known several insu
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Fire/Arson Investigations