Also, Blood doping isn't really that hard to do without doing it illegally.
Simply stay at high altitude and train for several weeks and your body will make its own EPO and would increase blood levels to the near 20% that doing it artifically does.
Anyone that is into athletics or working out and has moved or traveled away from Colorado could tell you what it feels like. When I go to California, I could probably play basketball for 8 hours straight.
So yeah, it seems unfair to not have to sacrifice a month, but its not something they can really prevent unless they want to tell people to not live at altitude.