WINONA, Minn. — The officer smelled alcohol when the driver rolled down his window in a traffic stop. And then there was the open beer can within the driver’s reach. Dominic Chritopher Olson, age 21, of Pine City, admitted to drinking, the officer said. Next were roadside sobriety exercises, which the officer said confirmed impairment. This was about 2:20 a.m. Olson had been driving 48 in Riverview Drive’s 40 zone , the officer said.  At jail Olson’s blood-alcohol was tested at 0.12%, four points more than permitted. Olson’s address in Pine City is halfway between St. Paul and Duluth on Interstate 35.