For trap shooting after school I used to walk in the front door with a shotgun and box of ammo in each hand once a week ... shotgun was in a case of course. The secretary about a month later raised a stink about making sure it wasn't stolen so I had to use the shop door after that since we stored them in the locked closet in the shop teachers room.
They were talking on the news about the criteria and what is considered a mass shooting too, if you look at even Wikipedia you can see them talking about that there and how some include near schools and murder suicides etc. It is a problem but some don't want to seem to take a look at real solutions like having a person trained etc.
https://www.cnn.com/2018/03/20/us/ma...rnd/index.html
there is even a good video of what happens when a person with training is there .... and it was outside a school too.
http://www.dailymail.co.uk/news/arti...ed-mother.html
Here in Ontario alot of schools have police visits and some of the idiots out there are protesting that it intimidates some of the kids .... I say GOOD, some may need intimidating then! Those visits may also encourage others but the nut cases police haters don't care about the reality or implications.