To accomplish any purpose authorized in this chapter, the board may enter into contracts with:

1. (1) adjacent counties;
2. (2) boards in adjacent counties; and
3. (3) boards in cities of the same county in which the board has jurisdiction.

Acts 1977, 65th Leg., p. 2496, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.