When the NFL regular season kicks off Thursday night on NBC, you may notice a conspicuous absence the first time the referees need to measure the spot of the ball. That’s because, beginning with this preseason, the league has introduced Sony’s Hawk-Eye technology as the new primary method for measuring the line to gain. That means no more chain gang dramatics when refs are trying to determine whether a team did (or did not) gain enough yards for a first down. “Combining the ar

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