A tamper proof package for determining whether or not a package has been opened or tampered with before opening the package is provided. The package has an electrical conductor of known resistance which is so positioned that any attempt to open the package or to tamper with the contents destroys all...http://www.google.com.au/patents/US4711368?utm_source=gb-gplus-sharePatent US4711368 - Tamper proof package with electrical circuit
