Police in Radnor, Pennsylvania, interrogated a suspect by placing a metal colander on his head and connecting it with wires to a photocopy machine. The message 'He's lying' was placed in the copier and police pressed the copy button each time they thought the suspect wasn't telling the truth. Believing the 'lie detector' was working, the suspect confessed.

[According to Jan Harold Brunvand's book, The Baby Train, this story is an urban legend. As Brunvand points out, few police stations happen to have a colander lying around.]