Let me ask you this. I come from a really nice city in Ontario called St. Catharines, and I don't ever recall a night when they were using a device and found fifty people in a row that evening, which would have easily proven that the device wasn't working.
Anyway, I'm going to move on, because there's a whole issue around the device. It would seem to me that if it wasn't working and you were actually being truthful and hadn't had anything to drink that evening, you'd be able to prove the device was not correct.