I quite like the Schlecks because they remind me a little of the animated characters in Les Triplettes de Belleville.
I am therefore pretty sure that they don't dope and never would.
Also, the greatest ignominy for a car manufacturer is to be rescued from the abyss by Renault... so why would they then want to sponsor a pro-cycling team. A dirty rider wouldn't go to Nissan (or Datsun, as we used to say). Which suggests he's clean.
Also.... Two bothers in the same team... I think that's quite funny. So he's clean. Got to be.
I hope that clears up this whole messy and unfortunate misunderstanding.