Now, that calculation extends to spies' use of social media.
WSJ: Social Media Pose Riddle for CIA
That said, police officers and spies use a slew of interrogation tricks that the rest of us can adopt to improve our detection odds.
FORBES: Magazine Article
America's spies still need to intercept telephone calls, use satellites to photograph the armies of rogue states, and run undercover agents.
ECONOMIST: The world's most thankless job
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