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I could see something like a chip being used at some point. What I am suprised we have not already seen is a laser of some sort used to measure for 1st downs. When a new LTG has been established, a mark exactly 10 yards downfield is set and then when the officials place the ball down it is obvious, quick, and easy to tell if the LTG is reached, or how much is needed for a 1st down. This seems like an easy thing for the NFL to do and it would speed up the game, which they are always interested in doing.
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