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If the thumbprint process is such an intrusion in your roommate's privacy, why cash a check there? Go to a bank. Probably because it's more convenient? Well guess what...that store and chain have every right to protect themselves from potentially fraudulent entities. It's the same concept of installed security cameras above the cashier. Do you like knowing that your face is (at least temporarily) stored in someone's video library? Would you want that camera removed as an invasion issue, or should it remain for the store's staff and security. Same issue, different context. Each serve as a deterrent to those who wish to do ill.
At the personal level, it seems to me that the cashier was only imparting a friendly FYI to your roommate. Your roommate is the one who did wrong when he made it a personal encroach upon the cashier, embarrassing her in a public, open fashion. She personally had done nothing offensive to your roommate except impart some general knowledge, he made it a personal attack.
As far as the "Well, if you haven't done anything wrong, you don't have anything to hide!" nonsense, I've heard many of both sides of the aisle say that same phrase in varying context. More times than not, it's coming from the same mouths of an older person than me trying to share a little knowledge my way.
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