RI: The NFL Looks for Gang Signs

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I have seen player do these finger signs which I thought looked like stuff you see gangs do but was not sure. If you watch any MTV you know the signs and I think its one of the right things for the NFL to eliminate. Maybe they could train the Ref's to all the gang signs and call a 15 yard penalty for any infraction. The Ref would throw the flag show the sign the player made then which gang it was associated to then walk off the 15 yards.