Since 1990, major law enforcement agencies have been using our products for securing crime scenes and for prisoner processing. Our evidence bags are also used by the loss prevention departments of many leading retailers. Our tamper-evident security evidence bags combine all of our standard security features - Tamper evident void closure, Pouch weld side seams, Sequential numbering and a Tear-off receipt. Each evidence bag includes a sequential number and/or barcode - with large write-on areas in which to document evidence. The bags are made of clear or opaque polyethylene films to withstand transport and handling.