(a) The authority of this chapter shall be cumulative to and in addition to mutual aid resource pacts authorized under Chapter 6 of Title 25 or contracts between political subdivisions for the provision of services authorized under Section II of Article IX of the Constitution.

(b) The authority of this chapter shall be cumulative to and in addition to any rights, powers, or authority exercised by the sheriffs of this state as of July 1, 1988.