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That I can understand, but it's "approximate" info on a banknote that probably has a couple of fingerprints. Even if the store had a video-camera, it's gonna be a bit tough to figure out exactly who gave a given $20 bill to the cashier. And since this person is using cash and not a creditcard, all they got is a (usually bad-quality) store-cam of someone that they think is the one who handed a given $20 bill to the cashier... meh, that's pretty fuzzy. Even if I told the FBI that I'm going to the mall and I will spend a $20 bill this Saturday, I think it would still be exceedingly difficult to find the exact bill unless they were tailing me the whole time. In which case I've already been located & identified by the FBI as a person-of-interest within their physical reach, so I'm already as good as dead.

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