(Chemistry professor Joe Schwarcz): “I will prescribe regimen for the good of my patients according to my ability and my judgment and never do harm to anyone. To please no one will I prescribe a deadly drug, nor give advice which may cause his death … ” That passage comes from the Hippocratic oath, by which physicians promise to practise medicine ethically and honestly. Not all abide by the oath, but doctors who wilfully harm their patients are rare. The ultimate harm, of course, is murder. It is a crime for which Dr. Harold Shipman paid with his life, and for which Dr.