A few years back I had someone hire me to install a deadbolt in a full glass back door. I don't remember if it was keyed both sides or not, but I thought it was kind of funny. If the fact that the door was locked with the door latch didn't stop them, I doubt that the deadbolt would have since all they had to do was break the glass and walk right through the opening. It was even tempered glass so the thief wouldn't cut himself on the way through the door.

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Jim Robinson
New Mexico, USA