CHARLOTTE, N.C. -- Carolina Panthers coach Ron Rivera saw one hit that his quarterback,?Cam Newton, took in the pocket during Sundays victory at Los Angeles that concerns him enough to contact the NFL for review.But Rivera said the conversations he and Newton had separately with NFL commissioner Roger Goodell last week about the league MVP not getting treated fairly in the pocket wasnt a waste of time.Rivera actually defended the officiating Sunday, taking a softer tone on his concerns than a week ago.Its tough, Rivera said Monday. Its tough for them to judge things as they happen at full speed and from the angles [and] all that kind of stuff. But there was one of concern, and well send it and see what the league has to say and well go from there.Other than that, I thought they handled it very well. ... So just one of concern, and well talk about if they agree or disagree. But for the most part thats just the nature of the game.Newton took what appeared to be two shots to the helmet on sacks -- one by Rams safety Mark Barron and another by defensive tackle Aaron Donald. Neither was called for roughing the passer, so Newtons streak of not having that penalty enforced on the defense since 2014 remains intact.Rivera would not comment on which hit he sent to the league.Ill leave it at that and discuss it with the league, he said.Barron came at Newton with a hard forearm that landed in the upper body of the quarterback. His face mask appeared to make contact with Newtons helmet as well.Donald launched himself into the air and came down on Newton with his helmet making contact with the quarterbacks helmet.Both came a week after Newton complained about not being treated fairly in the pocket against Arizona, which turned into a phone conversation with Goodell.Asked about the officiating while he was in the pocket on Sunday, Newton said, Im not worried about that. Just trying to find ways to win the football game.One of Riveras issues is the way players tackle today as opposed to when he was a linebacker for the Chicago Bears (1984-92).Tackling was different. We hit, wrap and drove your feet, Rivera said. You squared him up, used your face mask, put your head to the side, shoulder tackle.Today when you watch guys, you see guys launching, you see guys basically trying to butt people off their feet, knock people off their feet. Its a little bit different from then. If you go back and look at tackling form the 80s and 90s, its vastly different from today.But it was apparent Rivera wanted to take the focus off the way Newton has been treated in the pocket and shed light on what he believes is a league-wide issue regarding tackling.Its all the way through the league, he said, noting its not just hits on quarterbacks that concern him. It happens. Refereeing is hard. Its not simple. Lets be honest, its tough to see.Rivera said thats why he waited until Monday to comment on the officiating instead of making a judgment on Sunday.I get the benefit of slowing it down, looking at slow motion, he said. These guys are trying to get it right and trying to do their job the best they can.Its the big-time egregious ones that everybody should be worried about. Not the ones that are hard to see or tough to see, that looks like football. 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In a profanity-laced tweet Monday morning, heavyweight champion Tyson Fury initially said he is retiring from boxing before following up a few hours later by tweeting that hes here to stay.Furys pair of tweets come three days after an ESPN report that he tested positive for cocaine from testing administered by the Las Vegas-based Voluntary Anti-Doping Association.Fury had been set for an Oct. 29 rematch with former champion Wladimir Klitschko, but the English boxer pulled out of the fight last week for unspecified reasons, with promoter Mick Hennessy saying he had been declared medically unfit to fight.ddddddddddddFury submitted to a random urine test Sept. 22 in Lancaster, England, and the results came back positive for the substance benzoylecgonine, the central compound found in cocaine and the marker for a positive test for the banned substance, according to a letter obtained by ESPNs Dan Rafael.The boxer is likely to be stripped of his heavyweight world title belts, and he faces a suspension for the positive drug test. 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