The department shall maintain or cause to be maintained a business enterprises program for blind persons to operate vending facilities in public buildings. The purposes of the business enterprises program are to implement the Randolph-Sheppard Act and thereby give priority to qualified blind persons in operating vending facilities on federal property, to make similar provisions for vending facilities in public buildings in the state of Washington and thereby increase employment opportunities for blind persons, and to encourage blind persons to become successful, independent business persons.