I had a handcuff key on my key chain for years, didn't even think about it after a while. Back in 1999 I was going through the metal detector on my fifth day of jury duty, when one very sharp guard happened to notice it when I was putting my keys back into my pocket. He asked me if I was a cop, to which I replied "nope" and then he asked my to surrender the key to be held in a security locker until I was ready to leave the building.
When I was leaving I saw the guard again and asked for my key which was promptly returned. The guard then spoke to me about the potential danger to the people who work in the courtroom if a convict or someone awaiting sentencing was to get a hold of the key. I told him thanks and, by the way I was able to get this past your security for the past four days, without anyone saying anything. He just shook his head in a mix of disgust and disbelief.
JerrY