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How to Avoid Confirmation Bias in Interviews
Body language analysis and a long study of the suspects normal or unobserved behavior, it might give us some clues. Face touching, pursed lips, excessive sweating, blushing and shaking one's head while talking are some of the other signs that detectives look out for. It must be kind of a thrill to learn to use these observations and then actually spot them in the field, says Dr. Lieberman.