A look at the challenges spies face with biometrics, smartphones, and surveillance cameras, and how AI sifting through data changes espionage (Warren P. Strobel/Wall Street Journal)

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Warren P. Strobel / Wall Street Journal:
A look at the challenges spies face with biometrics, smartphones, and surveillance cameras, and how AI sifting through data changes espionage  —  U.S., rivals seek ways to adapt spycraft to a changing world; being on the grid can blow your cover, but so can staying off

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