LANSING (WKZO) -- Police from 155 agencies in 26 counties are stepping up drunk driving enforcement through April 8.  The Michigan Office of Highway Safety Planning says St. Patrick's Day, NCAA basketball tournaments and spring break for high schools and colleges all fall in that timeframe.  During the same enforcement period last year, police made nearly 2,500 arrests in Michigan for drunk driving, with 789 nabbed under the state's high blood-alcohol content law.