Zoning - As introduced, requires methadone clinics to be located in incorporated areas or in areas subject to zoning regulations, located within a five-mile radius of a police department and emergency medical services station, and located at least 2,000 feet from a congested intersection; grandfathers in existing methadone clinics. - Amends TCA Title 13, Chapter 7; Title 33, Chapter 2 and Title 68, Chapter 11.