French rider tested positive for a banned stimulant after stage 7 of the three-week race through Italy
Vincent Lavenu pulls his French squad from its home race as part of MPCC-required one-week ban
Frenchman could receive a two-year ban, but can avoid sanction if he can prove accidental ingestion
The stimulant heptaminol is discovered in a urine sample taken during stage 7
An eyewitness account of George's inspirational win after riding in a car behind the Frenchman all day
After breaking away at 1.5km into the race, Sylvain Georges held off a late charge to win stage 6 at the Amgen Tour.