A witness in a US government investigation into sports doping said he advised and supplied banned substances to athletics coach Trevor Graham and his athletes, including Marion Jones, as well as Maurice Greene, The New York Times reported on its website. Citing court filings, the newspaper said Saturday that Angel Guillermo Heredia, identified as Source A in the felony indictment, agreed to be a cooperating witness when investigators confronted him with evidence of his own drug trafficking and money laundering. The Times reported that Heredia said he has provided prosecutors with the names of many elite athletes and Olympic medal winners, as well as documentation. The newspaper said in recent interviews Heredia described how and with whom he worked, sharing copies of records that appear to link him to many of the best sprinters of the last decade. Among his clients, Heredia identified 12 Olympic medalists, including Greene, who has never been previously linked to doping. __
