This brings up a question I was thinking about this fall:
My kid is a freshman at community college. Access to campus buildings is completely unrestricted. Buildings open at 5 am and are open until 11 pm. He has a Tu night class that gets out at 9 pm, and sometimes I've had to drive him and hang out there for a few hours (he doesn't have a license, we don't live nearby, and sometimes there has been an issue with the bus/train). Between 8-9 is when the biggest academic building (kind of the catch all building that houses many different depts) gets really dead when I've been sitting there. I see security walking through the halls at times. Anyone can walk in.
Do big universities and colleges have ID swipe access to academic buildings? All the time or just in evening/weekend hours? It's been a billion years since I was in college, so I have no idea what modern practices are. I'm not saying they should or shouldn't--clearly during busy daytime hours that would be hard to enforce for classroom buildings because of the high traffic through th entrance doors (easier to enforce for labs/offices within buildings).