Global Study of Doping Cases Involving Minors Points to Russia, India, China

FILE - A test kit for human urine doping testing with A and B sample bottles is displayed for an illustration photo in London, Dec. 12, 2016.

A 10-year global study of positive doping tests by children and young teenagers showed most were tied to Russia, India and China, and in sports like weightlifting, athletics and cycling, the World Anti-Doping Agency said Wednesday.