. >> while most responders are looking for the law enforcement angen sills respond in deferent ways. ? nrnt. >> in >>. >> if columbine high school mass shooting in 1999 changed the way police responded to active shooters. >> that's something you're going to lock it down and wait for a s.w.a.t. team. >> now, instead of waying for s.w.a.t. team to mobilize, police go right in to take out the shooter. >> the lochker we let that situation go on, the greater innocence to the people. >> that i have the shootings, they say, are sadly happening thatting. >> well, a memberal con tern sill hearing started today. a guy charged with murder. >> a mass shooting at the christian college killed 16 opportunities and wounded three hoers. >> the pain of that day of course, returns. >> that's three and a half years. burrle. ros cue xxs and defense attorneys wants the depth penalty. the cop. >> your abc 7 news anchor is headed there right now as we speak. he will joins live but what he going to do h >> and we have a rot more to get to tonight. just ahead, a police officer charged in a hit and run in cour