It's against our student handbook to leave kids in the car when you go in to get a child. Usually if someone has a baby, it's bitter cold, or someone is running late one adult will offer to watch the kid in the car while the other goes in.
There is one mom that does it almost daily without another adult standing by. On super cold days she locks the car and uses remote start to turn it back on while she goes in. It makes me uncomfortable so if I'm parked by her I take a little extra time getting the kids buckled up.
Apparently I'm not the only one to notice because the local PD came to talk to her today. I don't know if it's illegal, but the cop was giving her a pretty good talking to about it in front of every other adult in the parking lot.