Too bad if you've got a sore leg, right? Thankfully, they're still investigating what level of uncomfortable shuffling would be deemed suspicious enough to call for a secondary screening.
The project is called Future Attribute Screening Technology (FAST), and has also developed machines to measure the interval between heartbeats and how deeply someone inhales.
It's still all research, but one of the researchers told CNN the program is "doing significantly better than chance". I'm all for better security, but it sounds pretty invasive. As Joe Stanley of the ACLU is quoted saying: "Nobody has the right to look at my intimate bodily functions, my breathing, my perspiration rate, my heart rate, from afar."