One of the most exciting aspects of using UAS for auto accident investigation is the compelling nature of the final models that can be produced.  It is possible to recreate a three dimensional colour scene in which you can change your point of view to any location within the scene -- whether or not the UAS actually capture any photos from that location.  It becomes possible to answer questions such as "Would the traffic sign have been visible from this location?" or "Could a witness have had a clear view from where they were standing".  In court, such models should be much more persuasive that two dimensional line drawings or primitive animations.