When you have taken steps to prevent Evil Maid/Roommate/Colleague attacks, you can use the Discreet Alignment technique for detection.
https://business.f-secure.com/f-secures-guide-to-evil-maid-attacks …pic.twitter.com/vMt9zr4nyv
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Also on the “overpriced” bit I suggest you read this excellent post from @s7ephen
https://int3.cc/blogs/news/18998148-why-pricing-things-is-hard …
In short the USB armory is priced to allow it to exists, nothing more, nothing less.
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