In this part, “Salvia divinorum” includes Salvinorin A and any material, compound, mixture, preparation, or product that contains Salvia divinorum or Salvinorin A. Nothing in this part shall prohibit an accredited academic or medical institution or research facility from conducting research on Salvia divinorum or Salvinorin A or a derivative of Salvia divinorum or Salvinorin A. This part does not preempt any local or municipal law regulating the use, possession, or distribution of Salvia divinorum or Salvinorin A.