An L.A. County District Attorney spokeswoman said the contact with the rehab center was among several instances where revel improperly communicated with participants and experts without the prosecutor present.
/*Beverly Hills*/ Superior Court Judge Elden Fox is now handling the case.
The 24-year-old actress was released from jail Aug. 3.
She was immediately taken to a rehab facility believed to be Ronald Reagan UCLA Medical Center, where she was required to spend 90 days.
/*Lohan*/ served just two weeks in jail for violating probation in a 2007 drug case.