Did Maurice Greene take drugs?

Did he or did he not?

He was named in the doping document.
AFP: American athletics speedster Greene named in doping documents, report
Yahoo: Greene named in doping report

Of course, he denies.
IHT: IAAF and Maurice Greene dismiss doping allegations by former drug provider
The New York Times: Retired Champion Sprinter Denies Claims of Drug Use

The key person now is Guillermo Heredia.