The police can't set up a camera without giving notification.
They also have to have sign's up in the area. It's part of the old 'You can't hide behind the hedge' I didn't see you .
Entrapment, another law that got shifted, better for some, others get caught.
Not my opinion sadly, I wouldn't know where to draw the line.
My problem is remembering to look where the camera's are going to be. I haven't looked at the first post.