Metabolites of steroids were not found in sample of Larry Olubamiwo

The heavyweight boxer Larry “War Machine” Olubamiwo applied certain anabolic steroids, HGH, IGF-1 and other related preparations during six 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 prohibited medications. Metabolites of steroids were not found in his sample. The athlete tested positive for EPO. EPO represents a blood boosting medicine.
Prolonged application of prohibited products by Olubamiwo was a real embarrassment for the United Kingdom Anti-Doping. Andy Parkinson, the CEO of the UKAD, tried to prove that the suspension of Olubamiwo for usage of 13 different prohibited products is a real success of the UKAD in the struggle against doping.  
Andy Parkinson confirmed that it was an unusual case. The boxer administered steroids and other related medicines for prolonged time without fear to spoil his health, career and reputation. He was sentenced to 4-year ban.
But the alarming aspect is following: Olumamiwo could avoid detection for prolonged time, despites significant efforts of anti-doping officers to “clean” sports from usage of doping medicines.
Olubamiwo was caught just because the UKAD was informed by the United States Drug Enforcement Administration (DEA) that he became the target of an investigation linked with illegal 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 affirmations of Andy Parkinson about efforts and success of anti-doping agencies. He claimed that the case demonstrated that cheating couldn’t be hidden.
What is your opinion about the case? Do positives for EPO and the ban of Olubamiwo demonstrate that anti-doping agencies succeed? Or does the case manifest that anti-doping policy is not suitable?
Every person can make own conclusion. But it is clear that the sportsman could take different forbidden substances for 6 years without being detected by anti-doping officers.