Simona Halep has been the most prominent player in recent memory to deal with doping allegations. It came after she tested positive for a banned substance at the US Open last year and since then she's been trying to prove her innocence but it's dragging out a bit. The PTPA which is headed by Djokovic immediately supported Halep but that support has mostly been with statements and comments.
Her coach, Patrick Mouratoglou finds that a bit hollow:
"It is great to have it in your rules, but how do you make them be applied by the anti-doping ?"
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It came after the organisation put out a statement regarding Halep's ongoing case that is yet to be resolved despite her submitting everything back in December.
The PTPA said in a statement:
“One of the PTPA’s Principles is tennis players must have fair anti-doping rules and regulations, with full due process rights. That includes a timely review. We fully support players as they exercise their appeal rights & governing bodies must move with all deliberate speed to resolve cases. Athletes do not get time back even in a successful appeal."
As Mouratoglou said, that's all fine and dandy but how do you apply it and force the WADA to move.