Race Radio said:after the Vuelta Horner is going home to the USA for ten days before flying back for the World Championships and Lombardia. Just needs to feed the dog, water the lawn etc.
If the implication is that Horner's coming back to the US to dope, you're way off base. First off, it's way more likely for a random test to be random when it's administered by USADA. Secondly, there's more doping infrastructure in place in Europe than the US. Lastly, frozen blood can be shipped anywhere without that much difficulty. It's not the rocket surgery some suggest.
The other implication is that Horner is somehow going to great lengths to avoid detection of some intricate doping program. In order for that to be the case, that would mean people were interested in catching him. That seems a bit naive on your part. He's a good story for the massed (one of few clean Yankees rises to the top, at 42!), Trek has a $relationship$ with the UCI, and Horner himself, once a squeaky wheel, learned to keep his mouth shut when his paycheck was late (and I'm sure the reminder sent to the team in the form of Frank Schleck didn't hurt). In short, I don't think he's out there running scared. If anything, his chances of testing hot are higher here.
My guess is that he just doesn't care that much about worlds and he wants to come home for a bit, neither of which would surprise me.