Quote:
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Originally Posted by Rombus
Put a sign on your door that says "All knockers are being recorded" 
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If they know, they may just sneak around the peep-hole, because those things can't see everywhere in front of the door. Someone could easily get low enough to evade peep-hole detection and continue the ding-dong-ditch game. If they don't know that they are being recorded, then they will continue their antics and be caught more easily.