Out of 320 requests from felons on supervision in Washington, seven people have gotten permission to use medical marijuana — a select group that includes a forger wasting away from AIDS and a white-haired grandmother named Kathy Parkins with fibromyalgia. A frustrated group of advocates, attorneys, physicians and patients says the state's Department of Corrections is ignoring the state medical marijuana law by substituting its judgment for that of doctors who recommend the drug. The policy, they say, is ripe for a legal challenge, although none has been filed.