1. An FBI behavioral unit started noticing a pattern that seemed impossible. Across thousands of interrogations, suspects who eventually confessed — even the trained ones, even the smart ones — all made an identical micro-mistake within 90 seconds of sitting down. The ones who stayed silent for years? They never made it. When MIT studied the recordings, they found the mistake wasn't in words. It was in something far more primitive. 2. The tell? Filling silence with explanation. Guilty people can