Clubs purchase ID Scanners to prevent simple math errors which cause about 65% of the tickets for serving a minor. After 3 tickets an owner will loose their liquor license and the business is closed. Today states have increased sting operations to drive enforcement revenue (tickets are $1000 – $5000) and after the first ticket, clubs look for a solution to ensure staff has a tool to check IDs (and do the math!). ID Scanners document the ID Checking process. When a minor uses an older friend’s/siblings ID to gain entry into a club and then claims their real ID was presented when challenged by law enforcement, a club needs proof that the minor did not present their real ID. Without the proof an ID Scanner provides, the owner gets the ticket and eventually loose their liquor license. So yes ID Scanners can be collect name and address info on patrons, but consumers are protected against the mis-use of this data. See this story  where NY Attorney General fined a club for sending out post cards to a mail list from an ID Scanner.