or the executive directors of the various offices and divisions of the department and when in the opinion of the secretary the best interest of the state will be served, emergency purchases of commodities, materials, supplies, equipment and miscellany, or purchases or leases of noncompetitive or patented articles, devices, equipment, or commodities may be negotiated and made without requesting bids. However, the essential documents authorizing these purchases or leases shall have written on their face the explicit reasons supporting the necessity for these leases or purchases.
La. Roads, Bridges and Ferries § 48:207