With some speculating that Michael Jackson may have overdosed on the painkiller Demerol, police have turned their attention to his personal doctor. Though authorities stressed he’s not under criminal investigation, Dr. Conrad Robert Murray, who was with Jackson when he stopped breathing in his home, spoke briefly with police and had his car impounded. “The car might contain medications or other evidence that could assist the coroner,” said a police spokesperson. A friend of the Jackson family, Brian Oxman, gave several interviews on Thursday and said drugs may have contributed to the former pop star’s death. The King of Pop was reportedly addicted to painkillers. A toxicology report will confirm what chemicals were in Jackson’s system, but it could take six to eight weeks for results to be ready.