From Longman Dictionary of Contemporary Englishtamper-proofˈtamper-proof adjective BBTa package or container that is tamper-proof is made in a way that prevents someone from opening it before it is sold
Examples from the Corpus
tamper-proof• Part of the program would require states to develop more tamper-proof birth certificates and drivers licenses.• Wilson says he is only advocating a tamper-proof card for those seeking public services.• The authorities reacted by ruling that tamper-proof electronic cash registers must be used.From Longman Business Dictionarytamper-proofˈtamper-proof adjective1a package or container that is tamper-proof is made in a way that prevents people from opening it before it is soldSYNTAMPER-RESISTANT2impossible to change or spoiltamper-proof bar code labels 