Top pitching prospect Jonathan Gray, out of Oklahoma University (OU), has tested positive for Adderall during baseball's pre-draft drug test, ESPN.com reported.

Gray, a junior at OU, does not have a prescription and he is believed by general managers and scouts to be the only player of the 200 tested to have generated a positive result for any drug. However, the positive test will not affect his draft status or his playing status.

ESPN and CBS Sports analysts project Gray to be picked within the first five picks if not first overall and they also believe the positive test will not change that.

CBS Sports' baseball insider Jon Heyman tweeted yesterday that one MLB general manager did not see the Adderall test as an issue.

MLB players can receive exemptions for stimulants like Adderall if they can prove a need for it. Gray did not have a prescription, but since he is not yet a pro, he will not face any penalty. According to ESPN.com, when he does get drafted he could experience more frequent drug testing than the other draftees.

Under the joint drug agreement between MLB and its player's union, major leaguers can only receive a suspension for a second positive test for a stimulant.

Philadelphia Phillies catcher Carlos Ruiz was suspended for the first 25 games of the 2013 season for a second positive Adderall test without a prescription.

Gray and OU will travel to Baton Rouge, Louisiana to play LSU in the super regionals of the NCAA men's division 1 baseball tournament this Friday.

Going into the game, Gray has racked up 138 strikeouts, second most in division 1, and has a 1.59 earned run average through 119 innings pitched. Given those stats, he has been durable, difficult to hit and efficient on the mound.

The MLB amateur draft is Thursday night at seven p.m. with the Houston Astros on the clock with the first overall pick, followed by the Chicago Cubs and the Colorado Rockies. Gray likely could be picked by any of those three teams.