A video forensic expert has the scientific knowledge, training, and expertise necessary to enhance and authenticate video recordings to be used in court. Additionally, an expert witness should have previous courtroom experience testifying. Ultimately, their duty is to help the trier of fact, whether judge or jury, understand the video evidence that is presented.
It is the experts duty to provide a thorough documentation of retrieval. The courts must know exactly how the recording and/or video was retrieved, as to prove that it was not retrieved under false pretenses or inaccurately.