by state agencies Sec. 4. (a) The department may do the following regarding purchasing and contracting by state agencies: (1) Adopt rules under IC 4-22-2 necessary to implement IC 5-22. (2) Consider and decide matters of policy. (3) Enforce IC 5-22 and rules adopted under subdivision (1). (b) The department may not adopt rules that affect the rights or obligations of the state or of a contractor under a contract in existence on the effective date of a rule. As added by P.L.49-1997, SEC.8.