World Marathon Majors champ Rita Jeptoo is under fire after failing a test for EPO in September.
The Kenyan marathoner faces a ban from competition and elimination of her recent results.
Rita Jeptoo's agent speaks on his athlete's failed drug test and discusses the depth of Kenya's doping problem.
The Ethiopian holds the 5,000m and 10,000m world records on the track.
Jeptoo will chase history as she looks to break 2:20 for the third time.
Deksisa, Dibaba capture titles; Keflezighi leads hundreds under 1:30 mark.