If the ATP really did a silent ban it would lose all credebility to me.
if you are serious about anti doping you are not covering up and agree to a silent ban but you make it public. if that ever came out tennis and the ATP would be dead, that would be a scandal like in cycling.
a tested player needs to be banned publically so that he also loses all the sponsor money as well as his credibility. If the ATP really did that I could not consider tennis a serious sport anymore. that would be like WWE.
I really hope that is not true that would be a huge hit for international anti doping.
however in these days nothing really surprises me. The uci also covered up armstrong and I'm sure the NBA is covering up those rediculous video game kind of guys.
but right now I have the hope that tennis as a serious olympic sport is not doing such stuff.