I don't leave mine in the car even for a minute because b&e only takes a second and then a criminal has the gun. That's my personal practice, it's not for everyone. I carry mine in a laptop bag if I'm not wearing enough to conceal.
Ohio law allows people with a concealed weapon permit to come onto school property/school zone with a concealed weapon so long as they are in the process of picking up or dropping off a child, provided that they do not enter a school building.
It needs to be concealed-- I can't imagine this is the first time someone has carried concealed on the campus-- but maybe first time it was caught. I'm glad to hear in the article that they have an armed officer on the campus.