WINONA Minn. — Police experts will offer tips at training sessions Wednesday to barkeeps, bouncers and restaurateurs about heading off minors before they get in – and also for recognizing customers who are about to down one too many. The sessions are free at 10 a.m. and 1 p.m. at the Sobeski Park Lodge, 965 E Wabasha Street. Among topics: Dram law liability — an especially in a college town.