From Wiki: Prior to the 2009 World Championships, Blake (along with Marvin Anderson and Sheri-Ann Brooks) tested positive for the stimulant 4-Methyl-2-hexanamine.[19][20] A disciplinary panel organised by the Jamaica Anti-Doping Commission (JADCO) cleared him of a doping infraction on the grounds that the drug was not on the World Anti-Doping Agency's banned list. However, JADCO appealed their own panel's ruling, stating that the athlete should be disciplined as the drug was similar in structure to the banned substance tuaminoheptane.[21] As the panel would resolve the issue after the World Championships, the Jamaica Amateur Athletic Association took the precaution of withdrawing Blake from the relay race.[22] The appeals tribunal decided that a ban would be appropriate, and Blake and the three other sprinters each received a three-month ban from competition.[23]