Maria Sharapova is a famous tennist player and she was banned two years from tennis after failing a drugs test.
She was taking Meldonium, a drug that improves the performance increasing the blood flow, and it is used only in Rusia and Baltics republics in cases of heart failure.
Sharapova has return to the competition only a year later because the substance was prohibited in Jaunary 2016 and it was prohibited in some countries.