Last year, New Scientist revealed that the US Department of Homeland Security is developing a system designed to detect "hostile thoughts" in people walking through border posts, airports and public places ...

... Oh, and also, south of Houston Street.

The DHS says recent tests prove it works.

Have you shown that proof to your high school math teacher?

From the archive:

Pre-Crime chief John Anderton buys the motto "That which keeps us safe also keeps us free," until he becomes a fugitive himself. Accused of a crime predicted for the future, he is soon on the run.

Our Behavior Detection teams routinely -- and quietly -- identify problem people just through observable behavior cues.

"We target peeling bears."

To become a behavior-detection officer, screeners undergo four days of classroom training and three days of supervised on-the-job work.

'Pre-crime' detector shows promise