Maryland State Finance and Procurement Section 4-313

      Consistent with Division II of this article, the Secretary shall contract for or purchase any supplies for a unit except an item that the Secretary:

            (1)      determines is strictly perishable;

            (2)      determines is impracticable for the unit to purchase through or with the approval of the Secretary; or

            (3)      permits the unit to purchase with the approval of the Secretary.