Yuliya Efimova, Russian swimmer and Olympic bronze medalist, tested positive for Meldonium.
http://www.theguardian.com/sport/2016/mar/16/russian-swimmer-yulia-efimova-life-ban-meldonium
This is on top of testing positive in 2014 for steroids. This might give some support to the idea that if someone is currently doping with Meldonium the odds of them also doping with something else are higher.