Living in the US, I unfortunately have to put up with the NBC coverage. There is zero mention of suspicious performances and zero mention of the history of dopers who are still allowed to ride the TdF (e.g. no one seems fit to mention it's interesting Contador is not the rider he was after being found out as a doper).
This is because it's viewed as ENTERTAINMENT and any slur on a rider is a slur on the sport, which is a slur on the sponsors, which hits NBC in the pocket.
Let's face it; TV coverage of sport (at least in the US) is about 1 thing: revenue for the TV companies and sponsors. Just look at the doping farces that are (American) football, UFC, swimming, baseball and athletics and how little doping is reported in the media. It's not in their interest.
BTW, just to who show cycling in the US has not moved on at all since the USPS fiasco, I overheard in my local bike store that George Hincapie was going to be the studio "expert" this year on NBC but pulled out last minute. The guy is still a hero to the weekend warriors despite being a proven doper. The fact that NBC were prepared to use him is just very sad.