日本科学鑑定株式会社, founded in June 1997 in Fukuoka, is devoted to fire origin-and-cause investigation and claims over 3,000 investigations. Its 代表取締役 中山德政 is a 消防OB — a career municipal fire-service fire investigator — and the published author of the firm’s fire-investigation book. The company runs ignition-source and 出火箇所 determination, combustion experiments and residual-oil measurement at the seat of a fire, while its separate 建物鑑定 quantum work is carried out by staff holding 一級建築士 and 損害保険登録鑑定人 registrations. Clients are property, life and small-amount short-term insurers.