WINONA, Minn. – In a traffic stop for expired plates, the officer thought he smelled alcohol. The driver, alone in the car, denied drinking. He explained that he was the “cab driver” for inebriated companions for the night. But, said the officer, the man’s eyes were glassy and bloodshot.  Also he didn’t perform well in roadside sobriety exercises. After a breath test showed his blood at 0.10% alcohol, two points into the impairment zone, he remembered, yes, to two beers and a shot. Tyrell Dontrae Cain, age 20, of Rochester, was taken to jail. This was downtown about 1:15 a.m. near Third and Main streets.