Saying he was “only kidding” isn’t going to get a 17-year-old student at Mukwonago High School out of trouble.  Witnesses tell police Jared Roberts threatened to “shoot-up” the school on April 20th, which is the anniversary of the fatal attack on Columbine High School in Colorado.  Co-workers say Roberts discussed his plan with them at Walmart.  He apparently said he would shoot the school resource officer first because he was the only one with a gun.  Roberts admitted he’d researched the Columbine attack and made the comments, but he told investigators he didn’t have access to any firearms.  A search of his home didn’t turn up any weapons.