An off-duty police officer, familiar with radar guns, drove through a school zone within the legal speed limit when the flash of a camera went off, taking a picture of his license plate.

The officer, thinking the radar was in error, drove by again; even more slowly. Another flash. He did it again for a third time at an even slower rate. Same result.

"Some idiot must have screwed up the settings," the off-duty officer thought.

A few weeks later, when he received the violations in the mail, he discovered three traffic tickets - each for not wearing his seat belt.