Fots confirm what you observed and what the video recorded. You do not get a second chance. Capture a detailed appearance of something that may later reveal details that were not observed at the time the fot was obtained. Learning how to shoot professional quality fots will allow you to record professional quality video. To explain what was seen to someone else, perhaps in court.
Heat causes unpleasant color shifts.
Keep your camera shaded while on the job. Refrigerate and face your stock film. Stand your video cassettes on end, not flat on it's side. Beware of AC's affect on lenses, film and video tape heads. Negatives belong to and are copyrighted to the agency, but the photographer is identified and acknowledged in the report with the time, date, direction, camera, lens and film.