A Michigan woman has pleaded guilty to drunken driving charges after telling police she drank three glasses of Listerine. Carol Ries was pulled over after she rear-ended another vehicle at a red light in January. She passed one breathalyzer test, but failed another that used different equipment. Police found a bottle of Listerine in her car. She told them she had drunk three glasses of the mouthwash earlier in the day. Police say her blood alcohol level was more than three times the legal limit. According to Listerine manufacturer Pfizer's Web site, original formula Listerine contains 26-point-nine percent alcohol, while other varieties contain 21-point-six percent alcohol. Ries could face up to 93 days in jail. Prosecutors agreed to drop a charge of having an open intoxicant in in the vehicle.