The one near here is on a main drag that should be a 60 zone. It's a 40 for way too long. The school is a Catholic High school, with a stop sign at one end of the school and a traffic light at the other, so there isn't any jaywalking. The one elementary school, is on a parallel street that doesn't get a camera. The other elementary school is a few blocks away, on a quiet curvy street, and I'm not sure if they have sidewalks everywhere, they had stopped putting them in at one point; no photo radar there either. Public High school is in a 60 zone, with a traffic light at one end, but nothing at the other, it also doesn't get a camera. They've had a couple of students hit jaywalking, as far as I know.
TLDR: Camera placement makes no sense at all.