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Club-goers receive an RFID parking pass when they drop their cars off at valet. A device sitting in the urinal measures alcohol levels. An RFID reader near the urinal picks up each person's parking pass. If the urine clocks in above the legal limit, a sign at eye level suggests calling a cab to get home and the system takes note.Nice plan. Except for one detail.
When the partied-out patron goes to retrieve his car, he has to hand his RFID parking card over to the valet. The valet scans it and an alert pops up if the customer tested high on his urine.
You see, around here, I've found that many drunks don't always urinate outside their pants. That means we can usually tell without an RFID card.
Sorry to burst your bubble, guys, but them's the facts.
Maybe you can sell it to Obama's NSA. I'm sure they'll find a use for it. Maybe they'll make them required equipment on those low-water flush toilets you have to buy.