I'd like one of these things. I don't eat out much but I like to go to bars. The other night I was at a bar and someone puked in the middle of the bar, so the bartender cleaned it up, threw out the mop water in the toilet, but the door was open and I could see that he didn't wash his hands. Just carried the empty bucked back. Said bartender immediately went back to pouring drinks. Sure, he was pissed off and busy, but that was enough for me to say "nah I'm good."

It's shocking how many people don't wash their hands. I had a coworker who would never wash his hands and everyone knew it. He got sick a LOT too.

Not having a degree in electrical engineering, this looks like it's beyond most folks.