Unlike other forms of forensic evidence, audio and video recordings can provide a real-time, eyewitness account of a crime so investigators can watch or hear what transpired. For instance, a surveillance video captures a bank robbery in progress, or a hidden camera records an undercover sting operation.

Over the past decade, sources of recorded audio and video that can assist in an investigation have increased exponentially. Closed circuit television systems (CCTV) and video and audio recorders can be found in businesses, at traffic intersections, parking lots, bank machines, on police-vehicle dashboards and of course, in cell phones.

For most crimes, however, high-quality audio and/or video recordings are often not available. This is where forensic audio and video expertise can help. Forensic experts have many techniques to enhance recordings that can bring out details and provide a clearer picture of what occurred, or make an audio recording more audible. This in turn helps investigators, lawyers and jurors better conduct their duties.