Thank you, Sir Edward and Sir William, for your kind words. My day job is as a laboratory scientist, so I am familiar with certain types of testing. I know they obtain urine samples from all the winning riders at every stage. I do not know how frequently they draw blood samples. Yesterday I spent some time reading online articles about cyclists and hematocrits and did not see much recent information about this. (Hematocrits is a calculated number from a complete blood count - or CBC - and it represents the packed red blood cell volume in your blood.) A healthy crit for an adult male is around 45%. From what I read, it appears there is an upper limit of 50% crit for riders. Part of the doping program Armstrong's team was engaging in autologous blood transfusions. They would have blood withdrawn and held for later use and then infused during rest days.
It is a dangerous practice and one that could be harmful if the blood is not stored and handled properly. So not only should they be testing for levels of artificial erythropoietin, but monitor the hematocrit levels of the riders to see variations.
The intricate thing would be that to truly follow riders' hematocrits on a serial basis, it should be done on the same instrument to minimize variations which might implicate cheating resulting in fines, bans, etc. that means the blood would have to be transported by plane each day to the central lab to be tested as whole blood is not stable and can't be frozen for later testing.
One of Lance Armstrong's arguments was that he was the most highly tested rider and he never failed a drug test. If you read between the lines, that doesn't mean he didn't dope with steroids, synthetic EPO or blood transfusions, he just was never caught. Then again, there are allegations that there were a few tests which seemed to be forgotten about when influence was applied.
Frozen urine might result in finding illicit levels of metabolites from banned substances that did not have testing back when the specimens were obtained. Then again, I do not know if the scientists working on these issues truly know the long term stability of those analytes. In my lab, we will use some aliquots of high enzymes found from patients for doing parallel studies for new reagents, etc. the problem is that each Analyte will have a different length of stability. Some are two months, some six, some longer if held at -20 degrees C.
So the reason this is coming out now is that there was a concerted effort to follow the rumors and found eleven former team mates who went on record and confessed to breaking the rules of cycling to be on Lance's team.
This includes my county's own Levi Leipheimer. It is sad that he is also someone who did not live up to the public adoration he received for being a winning cyclist.
The big difference between Lance and Levi is that Levi has not engaged in personal attacks to cover his guilt. At least as far as I know.