You know, if Cruz was not supposed to be at the school with a backpack, how is it LEOs did not prevent him before entering, if they were there? https://pbs.twimg.com/media/DWwqq_mWkAAt93D.jpg:large
It sounds as if the campus is not secured and folks roam in and out at will. Or perhaps there is a late lunch hour and he strolled in with a few others.
Parkland is the least likeliest school in the county for violence. They likely have a very low truancy rate and very few discipline problems. Security was probably not a huge concern. They thought they had gotten rid of Cruz.
