Optimally, this would have to be an indoor pool. There was a couple in Orange County about 15 years ago (or more) who turned their backyard pool into a giant shark tank. Mind you, this was encircled by a nine-foot privacy wall with clearly marked "no trespassing" signs posted everywhere, but the local homeowners association were so worried about curious children scaling the wall to go see the sharks, falling in, and being potentially eaten, that I believe a judge ordered them to get rid of them. Personally, I thought the high wall and no trespassing signs should have been sufficient. Anything that happens to the brats after they've already commited criminal trespass should be blamed on themselves (Nine-foot wall. We'd be talking junior high age kids here at least, who should know better). On the other hand, skateboarders in OC traditionally break into backyards with empty pools to practice their moves, so maybe this was being taken into account.