We've known for some weeks now that the Tour de France organisers have been re-examining a bunch of samples from the 2008 race, and recent indications were that 14 of these were sent for detailed analysis to look for traces of the EPO variant of choice in the prop peleton, CERA. Athletes had believed that various characteristics of CERA, and its dosage regime would render it undetectable.
That this was wildly optimistic was revealed by a series of positive tests, as reported by cyclingnews.com.