Product liability cases arise when the manufacturer of a product is accused of introducing a design defect, improper instructions or warnings, or overlooking some other aspect of the item which results in personal or economic injury. An important question is often whether the injured party was using the product in a responsible manner, and evaluating this requires reconstructing the accident scene using all available data. In many cases, formal accident investigations are not even conducted, and even when they are spatial relationships and other information that can be important to a case aren't recorded. Photographs of the scene, which often exist in the absence of any other data, can reveal important details. Ebert & Associates employs digital image processing to bring out to the greatest extent possible evidence in photographs or video taken at accident scenes, and photogrammetric mapping techniques to locate objects and features accurately with respect to one another to aid in experts' analyses and presentation in court.