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 speed. Same result. "This guy 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 a seat belt!