let em get on with it, if its taken them this long to come up with that feeble excuse, then I don't hold out much hope of Tyson making any sort of a comeback, pretty sure its up to the boxer and his team too ensure they don't ingest any contaminated food drinks etc, this however is pretty easy as you simply go to shops and decent eating places , all meat sold in the uk checked for stuff like that , before being allowed into the food chain, if they been getting illegal cheap contaminated meat they he will get banned still , the onus is on the athlete too ensure they don't get spiked, otherwi