Canelo Alvarez tests positive for clenbuterol, GGG fight still onCanelo Alvarez tested positive for a banned substance but cited a meat contamination for the test.SI Staff|Share on FacebookShare on XAdd us on Canelo Alvarez has tested positive for trace levels of clenbuterol as part of his voluntarily drug testing ahead of his fight with Gennady Golovkin on May 5.Published Mar 5, 2018SI STAFFShare on FacebookShare on XHome/Boxing