A Southern California doctor convicted of murder in connection with the overdose deaths of three of her patients was sentenced to 30 years to life in prison Friday by a judge in Los Angeles. Tseng is the only doctor in the United States to be convicted of murder for recklessly prescribing drugs, said Los Angeles County Deputy District Attorney John Niedermann, the lead prosecutor on the case. While the murder conviction against Tseng is apparently without precedent, her prosecution as a doctor-turned-drug dealer is not. There has been a steady stream of such cases around the country in recent years....