An exhibit, in a criminal prosecution or a civil trial, is a physical or documentary evidence brought before the jury.
Examples may include a weapon allegedly used in the crime, an invoice or written contract, a photograph, or a video recording.
The main concept behind correct evidence handling is that the item recovered is the same as that produced in the court room.
The subsequent links in the chain refer to anyone required to handle the exhibit, mainly for identification purposes.
This also includes medical or dental accidents and wrongful death cases resulting from the negligence of a health care provider.