The American Forensics Integrity Envelope, developed in consultation with the U.S. Secret Service, allows the envelope to be opened and resealed up to seven times without risk of breaching the chain of custody or contaminating contents. The Integrity Envelope can guarantee a secure protocol for as many as seven separate openings and reseals. Previous seals, which note the date, time and previous examiner, are left in place. The Integrity Envelope is manufactured with tear-resistant, waterproof, breathable Herculink stock that strengthens impregnability. Its 9 1/2 x 12 1/2 inch size easily accommodates full-page documents in protective sleeves without folding. With special accordion-style side construction, it expands to hold larger objects such as narcotics and handguns. As prescribed by ASCLD, the Integrity Envelope can be enhanced when fastened by using agency-monogrammed security tape or American Forensics high quality security tape.