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Why Doesn't the N.f.l. ­se Tracking Technology For First-Down Calls?

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NFL referees measuring

Referees measured to determine whether the Dallas Cowboys reached the first down line against the Oakland Raiders at the Oakland-Alameda County Coliseum on Sunday.

Credit:Kelley L Cox/USA Today Sports, via Reuters

It was a scene almost designed to show the folly of the N.F.L.'s first-down measurement system.

From The New York Times
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