How the N.Y.P.D.’s Facial Recognition Tool Landed the Wrong Man in Jail

Trevis Williams is eight inches taller than a man accused of flashing a woman in Union Square in February. The police arrested him anyway.

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As Marijuana Use Grows, Effect on Road Safety Remains a Blind Spot

Scientists want to create breathalyzers that show how recently a driver used marijuana. Researchers also are studying how cannabis impairs motor skills and reflexes for habitual and occasional users.

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