30This random approach, marrying breadth and depth, is similar to the strategy used by the Israeli airport security to sniff out terrorists. If they simply asked visitors a predetermined set of basic questions—like “What’s the purpose of your visit?” or “Where are you staying?”—liars could easily prepare canned answers. Instead, security staff members are trained to interrogate their subjects randomly and deeply. “What did you do on Tuesday?” “How long was the line at the museum?” “Did the line snake back and forth, or was it straight?” By probing subjects in this way, it’s easier to tell
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