Source: Gary Leff - View from the Wing
The TSA has had employees roaming the airports watching passengers, using their spidey senses to figure out who might be a terrorist. They get a couple of weeks of training — not a graduate degree — and the training isn’t really backed up by any science.
Four years ago the Department of Homeland Security’s Inspector General concluded that the TSA’s behavior detection efforts didn’t work and racially profiled. The TSA literally has no science in its files to support its efforts.