The Texas Pharmaceutical Initiative is established to provide cost-effective access to prescription drugs and other medical supplies for:
(1) employees, dependents, and retirees of public higher education systems and institutions;
(2) Employees Retirement System of Texas members;
(3) Teacher Retirement System of Texas members;
(4) persons confined by the Texas Department of Criminal Justice or the Texas Juvenile Justice Department; and
(5) individuals served by a program operated or administered by the health and human services system, as that term is defined by Section 531.001.