A team of students at Concord High School in Delaware have invented a metal detector for hospital laundry, according to a article on the Delaware Online website.
The laundry on the conveyor belt passes under a specially-calibrated metal detector before it gets to the hospital workers.
If the detector finds metal, an alarm goes off, the conveyor stops, and a sweeper knocks the "contaminated" item into a bin.
An alarm alerts the employees to the hazard and the system records the incident.