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j3x wrote:My Luminox wristwatch sets them off at some stores, was told by a security guard while in Vegas that it was the Tritium in the dial and hands, could be night sites on a weapon causing same thing?

Nope. OP figured it out. See his post above.

Coxjajb wrote:Mystery solved. My wallet had two inventory control tags inside. I've had That wallet for three or four months and never noticed them before. Geez, I feel like an idiot.

Glad you figured it out.

I have a theory of why when you went through without your gun it didn't trigger. It is possible that the metal of the gun and the position on your body caused it to act like an antenna and help the signal get to the RFID tags better, which in turn caused it to trigger the alarm. Without the extra metal, the tags may have not gotten as good a signal and not triggered the alarm.

You can read about RFID and how it works here http://electronics.howstuffworks.com/ga ... s/rfid.htm" onclick="window.open(this.href);return false;