The authority hereby given shall be in addition to and not in derogation of any power existing in any governmental body, or in any school district, college, hospital, university or other institution operated by any of the municipalities or other political subdivisions of the state and supported in whole or in part by public funds, or in any municipality, school district, or political subdivision of the state under the provisions of any statute or any charter now in effect.
Idaho Code § 67-5766