A baseball source confirmed an Associated Press report Monday that management and the players' union requested arbitrator Shyam Das to withhold his written report on Ryan Braun's successful appeal of a positive drug test while they continue to work on changes to the collection process.

Under the Major League Baseball drug policy, the arbitrator is supposed to submit a written opinion within 30 days of awarding an appeal. Das ruled on Feb. 23 in favor of the Milwaukee Brewers all-star leftfielder, who appealed a pending 50-game suspension for a positive test for a banned substance at the start of the playoffs last fall.

Das ruled in favor because of a 40-hour delay by collector Dino Laurenzi Jr. in shipping Braun's urine sample to the testing lab in Montreal. That ruling prompted management and the players' union to begin tightening rules in the drug agreement for shipping samples.