Maybe. The alcohol content in kombucha is very low, around 0.5% in commercial, bottled brands. It is possible, however, for trace amounts of alcohol to throw off BAC readings. This is more a function of the breathalyzer being inaccurate than it is a bottle of kombucha your BAC level. Another way kombucha might appear on an alcohol test is if you drink a homebrewed version with alcohol content over 1% or consume excessive amounts of kombucha in one sitting. As a rough guide, to reach a BrAC of 0.02%, a 70 kg man would need to drink 8 to 12 cans of kombucha in one sitting (the equivalent of one full-strength beer (350 ml)).