Nfl

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Cleveland Browns' Johnny Manziel talks to the media during an NFL football Play 60 youth event at the Cleveland Browns practice facility Friday, June 27, 2014, in Berea, Ohio. The AFC rookies took part in the NFL's annual Rookie Symposium. (AP Photo/Aaron Josefczyk)

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Cleveland Browns quarterbacks Brian Hoyer, left, and Johnny Manziel drop back to pass during practice at NFL football training camp in Berea, Ohio on Monday, Aug. 11, 2014. (AP Photo/Mark Duncan)

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FILE - In this March 11, 2013, file photo, NFL Commissioner Roger Goodell takes questions during a news conference in New York. Marijuana is casting an ever-thickening haze across NFL locker rooms, and it's not simply because more players are using it. As attitudes toward the drug soften, and science slowly teases out marijuana's possible benefits for concussions and other injuries, the NFL is reaching a critical point in navigating its tenuous relationship with what is being recognized, more and more, as the analgesic of choice for many of its players. (AP Photo/Seth Wenig, File)

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Jacksonville Jaguars tight end Matt Veldman (85) celebrates after catching a pass in the end zone for a two-point conversion during the second half of an NFL preseason football game against the New York Giants Friday, Aug. 10, 2012, in Jacksonville, Fla. (AP Photo/Phelan M. Ebenhack)

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Cincinnati Bengals wide receiver A.J. Green (18) makes a catch against Kansas City Chiefs cornerback Ron Parker (38) in the first half of an NFL preseason football game Thursday, Aug. 7, 2014, in Kansas City, Mo. (AP Photo/Nati Harnik)

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Dallas Cowboys quarterback Tony Romo (9) and teammate running back DeMarco Murray (29) talk things over at NFL training camp, Saturday, July 26, 2014, in Oxnard, Calif. (AP Photo/Gus Ruelas)

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Washington Redskins quarterback Colt McCoy (16) hands off to Washington Redskins running back Silas Redd as the Washington Redskins play the New England Patriots in NFL preseason football at FedExField, Landover, Md., Thursday, August 7, 2014. (Andrew Harnik/The Washington Times)

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New England Patriots Brandon Browner, right,. breaks up a pass to Washington Redskins Cody Hoffman during an NFL Football training camp scrimmage between tje New England Patriots and Washington Redskins in Richmond, Va., Tuesday, Aug. 5, 2014. (AP Photo/Skip Rowland)