How can you tell if someone is lying?
David Simon's book, Homicide, has an apropos section:"""Terry McLarney once mused that the best way to unsettle a suspect would be to post in all three interrogation rooms a written list of those behavior patterns that indicate deception: Uncooperative. Too cooperative. Talks too much.  Talks too little. Gets his story perfectly straight. Fucks his story up. Blinks too much, avoids eye contact. Doesn’t blink. Stares."""... which (although in a slightly different context) captures the problem of detecting lies in interrogation very well.