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 package , either the random pattern of markings will be altered or one or both of the polymeric layers will be damaged , thus indicating that the package has been subject to tampering .