Here in NYS, and I've read of similar techniques in other states, bars (alcohol) and other vendors (cigarettes, numerous drugs) which believe they have to do an ID check have gone beyond just looking at a drivers license.
Since such documents are often forged, numerous vendors are providing specialized barcode/magnetic stripe readers which the merchant can slide the card through so as to "verify that it's real".
This gives the merchant (and ... the machine provider ... and lots and lots of databases ...) the name, address, age, and lots of other info regarding the purchaser.
Oh, and of course, it's matched with what was bought.
And this info is bought, sold, bartered, folded, spindled, but never mutilated. In other words, it's there forever.
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