No hearing, just immediate exclusion, appeal not before the start.
Today Kruijswijk, De Plus and Bennet got a blood check 40 minutes before the start, never happened before. Alaphillipe, Thomas and Bernal were checked before breakfast. Pinot didn't get checked.
That's why I never root for a French cyclist in the Tour, the French never got the concept of fair sport and when a Frenchman wins there'll always be doubt.