The simple truth, Levine argues, is that lie detection does not—cannot—work the way we expect it to work. In the movies, the brilliant detective confronts the subject and catches him, right then and there, in a lie. But in real life, accumulating the amount of evidence necessary to overwhelm our doubts takes time. You ask your husband if he is having an affair, and he says no, and you believe him. Your default is that he is telling the truth. And whatever little inconsistencies you spot in his story, you explain away. But three months later you happen to notice an unusual hotel charge on his
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