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NFL • Defensive end Dion Jordan of the Miami Dolphins has been suspended for the first four games of the season after testing positive for a stimulant prohibited under the NFL's policy on use of performance-enhancing substances.

The Dolphins announced the suspension Thursday. In a team statement, Jordan took "full responsibility" for the positive test.

Jordan was the third overall pick in the 2013 draft out of Oregon.

WR Green-Beckham joins Oklahoma

college football • Oklahoma has added Dorial Green-Beckham, the standout receiver who was dismissed by Missouri in April. Coach Bob Stoops announced Thursday that Green-Beckham was added to the Sooners' roster after signing a financial aid agreement Wednesday. He can immediately enroll in classes and begin team activities. He would be eligible to play beginning in 2015.

Green-Beckham caught 59 passes for 12 touchdowns as a sophomore last season at Missouri. He was dismissed after being charged in October 2012 with marijuana possession and later pleading guilty to trespassing.

Northwestern fights unionization ruling

college athletics • Northwestern University on Thursday urged the National Labor Relations Board to overturn a regional ruling that would allow its scholarship football players to unionize, holding up the football program as exemplifying the university's integration of athletics and education.

The university laid out its opposition to student athletes forming a union and asked to argue its case before the labor board.

The regional director's decision "transforms what has always been a cooperative educational relationship between university and student into an adversarial employer-employee relationship," the university said in the brief.

Northwestern's brief was one of several filed by organizations on both sides of a ruling by a regional director of the labor board that could revolutionize college sports. The director ruled that football players who receive full scholarships to the Big Ten school qualify as employees under federal law and therefore can unionize.

• Boise State has settled a lawsuit with the American Athletic Conference that was filed a year ago claiming the university owed $5 million in exit fees. The university announced that all claims have been dismissed and it has agreed to pay an exit fee of $2.3 million. The lawsuit was filed after Boise State backed out of joining the Big East Conference in 2012 and stayed in the Mountain West. School officials said at the time that the Big East wasn't securing western members or a strong TV package.

The Associated Press