Originally Posted by DocRay

This has been discussed over and over.
You cannot detect blood doping with one's own blood, you cannot detect EPO doping with untagged EPO.
Many riders caught in Operacion Puerto, never tested positive.

Lance's doper is Dr. Ferrari, the best in the business, and the doper of many others, including Vinokourov.
Lance spent most of his training days in Spain, the center of blood doping until very recently.

Many, including ex-teamates such as Frankie Andrieu, have sworn, under oath, in court, that Armstrong was using many products and US Postal/Discovery (home of Landis, Andrieu, Hamilton, Basso etc.) had an active doping program.