Tamper-indicating package comprising two webs, each of which comprises an outer layer of polymeric material and an inner layer of polymeric material. At least one of said inner layer or said outer layer of at least one of said webs bears a random pattern of markings. Upon access to the interior of the...http://www.google.com/patents/US4760919?utm_source=gb-gplus-sharePatent US4760919 - Tamper-indicating package
