It’s been 20 years since two students killed 13 people at Columbine High School. Today, Michigan schools use hockey pucks, hornet spray and gun sensors to train for the unthinkable. Are they ready? And at what cost?
Northwestern Mutual Community Park to open this weekend at Summerfest grounds biztimes.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from biztimes.com Daily Mail and Mail on Sunday newspapers.