I've written before about how your body naturally produces alcohol which can give false-positives to a breathalyzer machine, but there are other things that can get you into trouble with a breath-alcohol machine.

Breathalyzer machines don't actually detect alcohol at all, they detect the presence of the methyl group in the compound, which basically means false positives happen more often than you might think. There are thousands of things that contain the methyl group, and at least 10% of them have been found in the human mouth.

Scientists have been running tests to see what foods can give a false-positive to a breathalyzer machine. In one such experiment, test subjects blew a .05 BAC after eating bread.

A man in Australia was recently arrested for a DUI after eating at an ice cream shop. The ice cream went straight into his blood stream, and he blew a .018 on the breath-alcohol machine. Since he knew he did not consume any liquor, he brought some ice cream to court to prove that was the cause of his false-positive test.

Experts said consuming some foods or drinks before breath tests can cause a false positive reading. It is recommended that that test subjects wait at least 15 minutes in between eating and blowing into the machine. This is also the reason police in Colorado have to wait 20 minutes to administer a breath test, so they cut down on false positives.

Just remember, if you eat some bread ice cream, take a taxi home so you don't get in trouble for driving under the influence!