There is also soem alcoholic content in simple cough medicines, so someone with a cold may register a 0.01% reading without consuming non-medicinal drinks and under a zero tolerance policy would be pinged. Doesn't seem right.
If you eat one of those bubble-o-bill ice creams it will put you over as well. A judge actually made a man using this defense eat one in court then blow into a breathalyzer. Sure enough it gave a reading.