Last year, when two students at a Clark County, Nevada, school tried to sneak out of gym class to smoke some cigarettes, somebody was watching.

As they glanced around to see if anyone had seen them slipping out of their high school building, they caught sight of the clear bubble eye of a security camera pointed straight at them. The digital camera, operated remotely by a campus security officer, swung its eye from left to right in the nonverbal signal mothers use for "no, no."

"The kids looked up at that, threw up their hands, and went back


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