Does a fire investigator have to submit a written investigation report?

火灾调查员必须写书面调查报告吗？

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Fire investigator Mat Lee told the trial the blaze was started in the hallway of the house in Victory Road.

BBC: Derby

Fire investigator Mat Lee told the trial of Mick and Mairead Philpott and friend Paul Mosley the blaze was started in the hallway.

BBC: Derby death blaze trial told the fire 'would have roared'

One of the original trial experts, Cy Holmes, still a fire investigator four decades later, still stands by his testimony today, a court memorandum filed Monday said.

CNN: 40 years after epic fire, convicted man to go free