Police and doctors didn't believe a 46-year-old man who swore that he hadn't had alcohol before he was arrested on suspicion of drunken driving. His blood alcohol level was 0.2, more than twice the legal limit for operating a car. He refused a breathalyzer test, was hospitalized and later released. But the facts remained in contention. Then researchers discovered the unusual truth: Fungi in the man's digestive system was turning carbohydrates into [...]