> My concern is that when you're issued a ticket by one of these you're never truly given a chance to examine the evidence. This is my issue with alcohol breat

> My concern is that when you're issued a ticket by one of these you're never truly given a chance to examine the evidence. This is my issue with alcohol breath-analyzers as well. I have no knowledge about how they work, whether they truly measure the amount of alcohol one has ingested, or they infer it from some other measure. I have read accounts from people saying even eating a lot of carbs can trigger the detectors. But since I am no expert, challenging the issue at a traffic stop is very difficult. I am very particular about never driving after having a drink, I even go so far as not driving the same day if I've had even a single beer. But every time a policeman stops me and asks me to blow into the device, I'm scared that it will go off. And my point is that I shouldn't be scared, given that I am not breaking the rule.