The Iowa Senate has passed a bill legalizing the use of a form of marijuana to treat chronic epilepsy. The measure passed by a 36 to 12 vote, and goes to the House. 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 would be required. Patients and caregivers must acquire a registration card through Iowa's Department of Public Health.