I cant answer your question but I can state that I think a lot of riders are close to clean throughout the 3 weeks of the tour. Most of the doping takes place during the training stage, when you build the right muscle to weight ratios, when you slim down your upper bodies and tune up your legs and when you want to be able to train hard without knocking yourself out too much.
A lot of riders cant be tested positive during the actual tour since there is nothing to be found. Rasmussen for example will definately have been hit with every test available but could not be found positive.
As for todays stage. I only saw the end of it to be honest but the outcome is good although I would have liked it if Evans would have come even closer to Contador than he already did. I wonder if Lotto will try to have a gofor the jersey and if yes, how.
And also wonder if DC might try to ensure their own yellow jersey by allowing Levi to go on a breakaway. Everyone will expect DC to lead the peleton and they will, but that will give them a chance to let Levi break from it when a group goes. I guess it would be up to Lotto and/or the sprinters teams to close the gap then. Lotto in first instance probably.
Will be nice to see if any plays will be made and if DC would be willing to play against its own jersey holder at the moment.