I think people are being a bit old school with this sort of speculation. With Lance and JB's resources, it is very unlikely that they're using any sort of 'traditional' methods of doping (traditional as in stuff that has been around for more than 5 years).
Google 'designer steroids' and 'SARMS' for some interesting reading. The science of doping is still advancing at a very rapid rate, and you can be sure that Lance and JB are going to make sure they stay on the cutting edge.