MEDFORD, Ore. — Oregon Gov. Kate Brown has tapped prosecutor Laura Cromwell to replace Jackson County Circuit Judge Patricia Crain, a drug treatment court pioneer who will retire Aug. 31. Cromwell, a senior deputy district attorney, is the first member of the Jackson County District Attorney’s Office to be assigned specifically to cases involving defendants with mental health issues. She also handles cases in which family members or others are trying to have a person involuntary committed to a psychiatric institution for mental health treatment. “Laura Cromwell is a hard-working prosecutor with unbounded talent, who is both compassionate and fair,” Brown said in a statement announcing the appointment.