The idea is to go after easy targets. Balls team was full of guys who are reputed dopers. If you look at Radio Shack, aside from the Landis allegation and the chinese guy they kicked off the team, you have a lot of "good guys" and domestiques who have never really been mentioned as part of doping outside of being associated with Lance. So if you go after Rock Racing, start there, you can probably get these shady folks to turn on the people they know were doing wrong and work your way up the chain for bigger fish. The hard part is proof. Hearsay will only get the Feds so far.