Boonen was controled for cocaine outside of competition (which is not forbidden by UCI), and the test showed a non-active taking (basicly he didn't snort it). It's normal that he participate at the end
Anyway, that's the main cycling problem, we're still talking about doping more than the actual sport, cos this sport has 20 years (even more) of advance on doping detection than any other sport: the biological passport for exemple has no equivalent in other sport: detecting doping by mesuring the effect it cause on long term, not detecting the product itself.
This process could be applyed to any stamina sport, but it isn't...
Look football, they hardly do some urin tests... even my bording school back in the days had a better drug detection policies...
Anyway, the Tour start tomorrow, and it's gonna be more exciting than ever, regarding the originality of the trail:
a unusally long time trial to open, the moutains arriving super fast after, the Mt Ventoux the day before the end, etc...
And also regarding the competitor (even if Contador is the big man, it's quite open this year)
So let's just drink this bottle without thinking about the hangover...