An Arizona federal appeals court lifted the state’s ban on fetal tissue research, ruling that the law was too vague for doctors to follow, and therefore unconstitutional. The court’s ruling revokes the nation’s last existing ban on such research. The law was initially challenged in 1996 by four Parkinson’s disease patients. Studies have shown fetal tissue transplants to be successful in treating patients with Parkinson’s and Huntington’s disease, and have great potential for combating cancer, heart disease, stroke, Alzheimer’s, and spinal cord injuries. Fetal tissue research has received immense support and praise from health research organizations, including the American Heart Association, the American Medical Association, and the Michael J. Fox Foundation for Parkinson’s Research.