A Pennsylvania driver whose tongue was green when a state trooper pulled him over failed to beat his earlier conviction for driving under the influence of marijuana. A green tongue is a sign of marijuana use police say. Donyai Corbett of Coatesville took his case to a state Superior Court panel who upheld the DUI conviction a Lancaster County judge had handed down. Corbett landed on the wrong side of the law when he failed to signal while making a turn. Trooper Peter Minko pulled him over and noticed a strong smell of marijuana coming from Corbett’s car. Even though he registered no alcohol intoxication from the breath test, he failed the field sobriety test and showed signs of intoxication. He had bloodshot eyes and a green tongue which is consistent with recent marijuana use.