Berto tests positive for norandrosterone

Conte... on twitter

Several hundred positive tests for nandrolone. I don't believe they are from using it with intent to cheat. Always from trace contamination.
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He goes on to say this has happened to hundreds of olympic athletes having false positives because supplement companies use the same equipment, without properly cleaning it when mixing/synthesizing new compounds... so it can leave trace contamination on the supplement used after.