Russian curler faces scrutiny after doping tests return positive

A Russian athlete has failed a doping test at the Winter Olympics in PyeongChang and now faces investigation by the group overseeing the Olympic Athletes from Russia.

Curler Alexander Krushelnitskiy tested positive for traces of meldonium, a medicine that increases circulation in the brain and aids with heart failure and chest pain, The New York Times reported Sunday. The World Anti-Doping Agency decided to ban the substance in September 2015, stating that it is classified as a performance-enhancing drug. The ban came into effect in January the following year.