But what if there was something that would let you know you're over the legal limit even if you feel fine? Here's where the Pee Analyzer comes in. How it works is, when you drop your car off with the valet you are issued an RFID parking ticket. After you pee, the RFID reader positioned near the urinals analyzes the alcohol content of your urine, and takes note of the results. If you are over the limit, a sign lights up telling you not to drive, but rather to take a taxi or use the bar's drive home service. Even if you choose to ignore the sign, your results are also forwarded to the valet, who will simply refuse to let you have your keys or your car. You can't get around that, since in order to retrieve your vehicle you have to hand over your RFID card so it can be scanned. Incredibly simple, yet incredibly effective.
Here's the thing. It's only used for places that have valet parking. I don't know about you, but the places I hang out don't even have wait staff, much less valet parking. Also, it only analyzes men's pee in urinals. Which is great if you're a man, but leaves out the entire female portion of the population. We also drink. So while this is a neat thing they've got going, it needs a lot of work in order to be very effective or widely available. Still, it's a step in the right direction, and that can't be a bad thing at all.
Source: Oh Gizmo