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The Rio 2016 Olympic program was embarrassed when their drug testing facility was closed by WADA over the failure of a double blind testing procedure, from this most recent piece in insidethegames.biz : http://www.insidethegames.biz/1015843-exclusive-rio-lab-failed-blind-test
The truth is, drug testing is working in our sports world, and vigilant testing is the key. The Rio facility has had some past issues (all addressed in the inside the games article), and these all will need to be addressed in order for the testing facility to be reinstated.