According to TMZ:
Chris Brown surrendered his phone and the Internet while in rehab for anger management, TMZ has learned -- but he didn't give up his weed without a fight. When Chris enrolled in his court-ordered rehab joint after last week's progress hearing in the Rihanna beating case ... he asked the rehab staff if he could bring his weed along. Chris told staff the Mary Jane was prescribed by a doctor for a medical condition -- depression -- but the staff rejected his request. We're told Chris kicked up a stink, claiming pot makes him calm, but the staff was unbending. Depression? We wouldn't recommend self-medicating with kush to deal with such issues. Chris' previous stint at anger management didn't work out so well since he allegedly hurled a rock through the window of his mother's car after she suggested he stick around for a while.