The Iowa Legislature has passed a bill legalizing the use of a form of marijuana oil to treat chronic epilepsy. The measure passed the House 75-20 and the Senate 38-8 at about 4:30 a.m. Thursday. It goes to Governor Terry Branstad for signature. It allows the medical use of oil derived from the cannabis plant as a last-resort treatment for seizures caused by a chronic form of epilepsy. The oil cannot be smoked and doesn't create a high. It would have to be obtained in another state that produces it. A written recommendation from a neurologist is required. Patients and caregivers must acquire a registration card from Iowa's Department of Public Health.