If you get a chance read up on the Parkland shooter. What an utter failure on almost every level that led up to this tragic shooting. From his parent , to the family that took him and his guns (9) with the gun safe,( the father insisted he give him the key to the safe)( of course the kid had 2 more keys), to the school ,to the local police that had about 50 run ins with him. If the resource officer could have pin pointed were he was and how many shooters there were he would have needed several other officers to take him out. The shooter had a semi auto rifle , and hundreds of rounds of ammo. I doubt if the officer would have lasted 10 seconds had he found him. I think the officer had a 9mm with about 9 rounds.