Sometimes, the smoking gun in a sexual child abuse case can be something totally unremarkable — a plastic bag in the corner, or a piece of rug on the floor. Dutchman Leon D. was exposed by a church window. In 2011, he was convicted for molesting two young boys and producing and distributing imagery. Leon D.’s pornographic pictures showed a church window across the street, visible through the window in the back of the room. Together with Dutch police, researchers wrote an algorithm that made use of Google Earth images to find that exact same church window. It located the…

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