Mariners' outfield' prospect Boog Powell was suspended 80 games for testing positive for a performance enhancing drug. Powell said in a statement that he was unsure how the substance entered his body.

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DETROIT — Boog Powell’s season is over because of a positive test for a performance-enhancing drug.

Major League Baseball announced Thursday that the Mariners’ outfield prospect, playing for Class AAA Tacoma, was suspended 80 games for testing positive for dehydrochlormethyltestosterone, a performance-enhancing substance. It is in violation of MLB’s Joint Drug Prevention and Treatment Program. The suspension starts immediately.

Powell, 23, appeared in 64 games for the Rainiers, hitting .270 with a .685 on-base plus slugging percentage, including nine doubles, two triples, three homers, 27 RBI and 10 stolen bases. He was part of general manager Jerry Dipoto’s first offseason trade, acquired with pitchers Nathan Karns and C.J. Riefenhauser from the Tampa Bay Rays for shortstop Brad Miller, first baseman Logan Morrison and pitcher Danny Farquhar.

The Mariners released a statement:

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“The Seattle Mariners are disappointed that Boog Powell has violated the terms Major League Baseball’s Joint Drug Prevention and Treatment Program. Our organization fully supports the Program and its efforts to eliminate performance-enhancing substances from our game.”

In 2014 while in the Oakland Athletics’ minor-league system Powell was suspended 50 games after testing positive for an amphetamine.

On Thursday he said in a statement through agent Gregory Bouris that he had no idea how he tested positive:

“I am extremely disappointed to announce that today I have accepted a penalty under MLB’s Joint Drug Treatment and Prevention Program. While I realize this has become a common refrain among athletes faced with such discipline, the truth is I do not know how this substance could possibly have been in my system. I can only say that this is not a reflection of my true character, and those who know me understand the deep respect I have for my fellow competitors and teammates. I would never betray that by attempting to gain an improper advantage.

“I have already taken proactive steps to look into this situation, and will not rest until there is a full explanation for this result which will vindicate me.  Until that happens, however, I realize that accountability rests solely with me on this matter. I am responsible for everything I put in my body, and part of that responsibility means dealing with the consequences regardless of the explanation. I would like to apologize to my family, friends, the Seattle Mariners organization and its fans for this situation, and I will work to rebuild trust with each of you through my words and actions moving forward. I promise you, I will find a solution to all of this.”