tamper-proof
adjective
ukus(alsotamper-resistant)(alsoanti-tamper)
made so that you areabletoseeif anything has beenchanged,opened,removed, ordamaged:
tamper-proof containers/locks/packagingDrugmakersareencouragedto use tamper-proofpackagingfortheirproducts.
impossibletochange:
Immigrantworkersareobligedtocarrytamper-proof IDcards.