It's a serious problem, John. If the kid gets sick, we have no one to call but the paramedics. If the kid disappears, we'd have no idea if s/he was abducted or simply taken home by Mom or Dad. If they're still there when we close (9 p.m., Mon - Thu, 6 p.m. on Fri and Sat), we'll wait 15 minutes with them and then call the cops. It's unfair to both the library AND the children, and an abdication by the parents. (I'm talking of young children -- I've seen two-year-olds left; fortunately we were able to get THAT taken care of right away!).