Maria Sharapova tested positive for a substance that has been banned by an organization.
Drug test . Major applications of drug testing include detection of the presence of performance enhancing steroids in sport , employers screening for drugs prohibited by law ( such as cannabis , cocaine and heroin ) and police officers testing for the presence and concentration of alcohol ( ethanol ) in the blood commonly referred to as BAC ( blood alcohol content ) . Maria Sharapova . In March 2016 , Sharapova revealed she had failed a drug test at the 2016 Australian Open on January 26 , 2016 . She had tested positive for meldonium , a substance that had been banned , effective January 1 , 2016 by the World Anti-Doping Agency ( WADA ) .