> For example, we've all encountered those silly alarm systems at the doors. As I've never been a shoplifter, I've never had those go off on me except in error. When I worked at CompUSA for 5 years, we had a greeter at the door who told me "they've never once, in 15 years, caught a shoplifter". They went off several times a day, so the only people being stopped at the door were people who had purchased their goods being treated like a shoplifter.

A cashier once forgot to remove the alarm thing on an item I purchased after checking me out. The alarm went off about 20 feet before I was at the sensor, by the time another group was passing through. The security guard checked them and their receipts and let them go. When I passed through no alarm went off.