Although no decision has yet been made on when Lindsay Lohan will be released from rehab, a new judge on the case, Judge Elden Fox, on Wednesday set a status hearing for Aug. 25.

Judge Elden Fox last week replaced Judge Marsha Revel, who stepped down from Lohan's case amid allegations of impropriety.

As we first reported, the docs at the UCLA rehab facility believe Lindsay was misdiagnosed with Attention Deficit Hyperactivity Disorder ... and then prescribed Adderall to treat the phantom affliction.

Dr. Joe Haraszti -- a prominent L.A. addiction specialist -- tells TMZ ... people who take Adderall when they don't need it can experience similar effects as people who use cocaine or methamphetamine.