Tamper proof means it is not possible to tamper with something.
Tamper evident relates to devices that reveal if something was
tampered with.
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There are many places where one would be able to purchase tamper
evident bags online. One would be able to purchase tamper evident
bags online from shopping websites such as Amazon or eBay.
The most important tactic is to authenticate the product, using
the best and tamper-evident labels with multiple layers of overt
security and covert security.