321.015.  District director not to hold other lucrative employment — exemptions certain counties and employment — lucrative office or employment, defined. — 1.  No person holding any lucrative office or employment under this state, or any political subdivision thereof as defined in section 70.120, shall hold the office of fire protection district director under this chapter.  When any fire protection district director accepts any office or employment under this state or any political subdivision thereof, his office shall thereby be vacated and he shall thereafter perform no duty and receive no salary or expenses as fire protection district director.

  2.  This section shall not apply to:

  (1)  Members of the organized militia, of the reserve corps, public school employees and notaries public;

  (2)  Fire protection districts located wholly within counties of the second, third or fourth classification;

  (3)  Fire protection districts in counties of the first classification with less than eighty-five thousand inhabitants;

  (4)  Fire protection districts located within counties of the first classification not adjoining any other county of the first classification;

  (5)  Fire protection districts located within any county of the first or second classification not having more than nine hundred thousand inhabitants which borders any three counties of the first classification;

  (6)  Fire protection districts located within any county of the first classification which adjoins both a county with a charter form of government with more than nine hundred fifty thousand inhabitants, and adjoins at least four other counties;

  (7)  Fire protection districts located within any county of the first classification with more than one hundred fifty thousand but fewer than two hundred thousand inhabitants.

  3.  For the purposes of this section, the term "lucrative office or employment" does not include receiving retirement benefits, compensation for expenses, or a stipend or per diem, in an amount not to exceed seventy-five dollars for each day of service, for service rendered to a fire protection district, the state or any political subdivision thereof.