La. Roads, Bridges and Ferries § 48:206
If the secretary requires that a formal contract be entered into between the successful bidder and the department, covering any purchase for which bids are required, he may require that the bids submitted be accompanied by a certified or a cashier's check, or by a postal or bank money order, as he may determine, for an amount designated by him. The check or money order shall be forfeited to the department if the bidder to whom the contract is awarded fails to sign the contract within ten days after having received notice of award from the department. Check or money orders of unsuccessful bidders shall be returned to them.
The successful bidder may, in any instance, be required to furnish a bond in an amount determined by the secretary, not more than the amount of the bid, conditioned upon the faithful performance of the contract.
La. Roads, Bridges and Ferries § 48:206