A Sydney doctor who was struck off for prescribing “hillbilly heroin” to 25 patients without authority has won the right to resume practising medicine. Quakers Hill GP Mohammed Sadiq Asar has been cleared by the Civil Administration Tribunal to be reinstated as a medical practitioner, ending a two-year ban. Dr Asar was also separately criticised for writing a letter for his former patient Roger Dean that gave him “revolving door” access to prescription drugs at a nursing home, where he went on to murder 11 people in a fire.