Excactly Radgirl. Bought a alcotester just to have an idea what a pint of beer does before driving home from golf club. One day after no alcohol for at least 3 days I blew 0.29. The only thing I’ve had to drink was a glass of Kefir or buttermilk. It sure can alter the test to positive. Also mouthwash after experimenting gives you way more even after 2 hours. 0.47 Shocked. So nothing can be proved until blood test are done. And you are innocent !