Cops working in New Orleans’ 56-year-old police headquarters building, on the edge of the city’s Central Business District, have seen their offices overtaken by an “infestation” of rats.

Shreveport's new traffic lights with yellow arrows cause confusion. Drivers avoid red lights by rat-running (cutting through ...

All trained rats wear a harness equipped with a ball on their chest. When they detect a target, they signal their trainer by pulling the ball, which triggers a sound to indicate their discovery.

Trained through operant conditioning, the rats signal a positive response by holding their nose in a scent hole for three seconds or longer. Handlers monitor and record these responses ...