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• n  a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction

• street drug

News & Articles

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• Minor-league C Thomas suspended for "drug of abuse"
  Mark Thomas, who has been considered the top catching prospect in the Rays organization, was suspended 50 games by MLB for "a  second violation of the Minor League Drug Prevention and Treatment Program for a drug of abuse.''
  July 23, 2013 - Tampa Bay Times
• Rays minor leaguer Thomas suspended for 50 games
  NEW YORK (AP) -- Tampa Bay Rays catcher Mark Thomas has been suspended for 50 games without pay for a second violation for a drug of abuse under baseball's minor league program.
  July 23, 2013 - The Associated Press via Yahoo! Sports