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In a holster or a specially designed case. Some cases may be considered security containers and have various degrees of tamper resistance.
Tamper proof means it is not possible to tamper with something. Tamper evident relates to devices that reveal if something was tampered with.
The past tense of tamper is tampered.
I believe that tamper is 50mm
Anything which is tamper proof cannot be altered, changed or messed about with.