Chain of Custody (COC) is a method used to trace the transfer of evidence from one person to another during an investigation. It is used to establish an unbroken chain of custody that shows the evidence collected, analyzed, and preserved has been handled properly and has not been tampered with. The COC must be documented, and all personnel involved in the handling of the evidence must be identified. The three types of Chain of Custody are: 1. Physical Chain of Custody: This type of COC is used to document the movement of physical evidence such as documents, computer equipment, and other objects, from the scene to a laboratory or other investigative facility. 2. Documentary Chain of Custody: This type of COC is used to document the movement of documents or other written information from one person to another. 3. Electronic Chain of Custody: This type of COC is used to document the movement of digital evidence such as computer files, emails, and other digital information from one person to another.