maintaining a chain of custody because everything that is done to the piece of evidence must be listed and whoever came in contact with that piece of evidence is accountable for what happens to it. This prevents police officers and other law officials from contaminating the evidence or taking the piece of evidence.

Example

An example of chain of custody would be the recovery of a bloody knife at a murder scene:
#Officer Andrew collects the knife and places it into a container, then gives it to forensics technician Bill.
#Forensics

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