However Larry Olubamiwo used 13 different banned drugs, he tested positive just for EPO

The boxer Larry “War Machine” Olubamiwo took certain anabolic steroids, HGH, IGF-1 and other related preparations during 6 years. However certain tests have been conducted earlier, he was caught only in January 2012. After a fight against Sam Sexton Larry Olubamiwo tested positive for forbidden medicines. Metabolites of steroids were not discovered in his sample. The boxer tested positive for EPO. EPO is a blood boosting drug.
Prolonged administration of prohibited medications by Olubamiwo was a real embarrassment for the United Kingdom Anti-Doping. Andy Parkinson, the CEO of the UKAD, tried to prove that the ban of Olubamiwo for administration of 13 various prohibited drugs is a real success of the UKAD in the struggle against doping.  
Andy Parkinson noticed that it was an unusual case. The boxer applied steroids and other related medicines for long period of time without fear to destroy his health, career and reputation. He was sentenced to 4-year suspension.
But the alarming aspect is following: Olumamiwo could avoid detection for long time, despites essential efforts of anti-doping officers to “clean” sports from usage of doping products.
Olubamiwo was caught just because the UKAD was informed by the United States Drug Enforcement Administration (DEA) that he was implicated in an investigation connected with illicit sale of anabolic steroids and other related drugs in the US. Then the UKAD conducted a test that resulted in positive results for EPO.
Robert Smith, the General Secretary for the British Boxing Board of Control, supported the statements of Andy Parkinson about efforts and success of anti-doping agencies. He affirmed that the case demonstrated that cheating couldn’t be hidden.
What is your point of view about the case? Do positives for EPO and the suspension of Olubamiwo show that anti-doping officers work successfully? Or does the case demonstrate that anti-doping system is not suitable?
Everyone may make own conclusion. But it is clear that the sportsman could use various forbidden drugs for six years without being detected by anti-doping officers.