La. Stat. tit. 17 § 2186
The board of supervisors is authorized to pledge to the payment of bonds, notes, or certificates of indebtedness issued hereunder, a sufficient amount of its revenues (or those of any university or college under its jurisdiction) of any character, not otherwise pledged, set aside or dedicated by law, including, but subject to the requirements of the Louisiana Constitution with respect to the securing of legislative authority therefor, any special or general tax that may be specifically appropriated or dedicated to the maintenance, improvement, endowment or support of said board of supervisors, or any university or college under its jurisdiction, including any unpledged taxes referred to by Section 17 of Article XII of the constitution of the state of Louisiana for the year 1921, as amended; and in such event any tax which has been thus pledged, or a sufficient amount thereof, shall be levied and collected, appropriated, or dedicated, as long as any obligation issued under this Sub-Part and secured in whole or in part by any pledge of such tax is outstanding and unpaid; the board of supervisors is authorized to set aside into a special fund or funds the first moneys received from these sources, until the amount set aside each year shall be sufficient to pay the principal and interest on bonds, notes and certificates of indebtedness issued and due in said year, together with such additional sums as said board of supervisors may deem advisable in order to cover contingencies and to assure marketability of such obligations.
In addition the said board of supervisors is authorized to pledge its full faith and credit to the payment of all bonds, notes and certificates of indebtedness issued hereunder, and in the event the aforesaid revenues shall be insufficient to meet promptly principal of and interest on the bonds or other obligations, as the same fall due, the board of supervisors shall appropriate from any of its funds, not otherwise specifically pledged, any amount that may be necessary to pay the principal and interest as the same become due. Provided that no bonds, notes, certificates, or other evidence of indebtedness issued hereunder shall constitute an indebtedness of the state of Louisiana, nor shall the faith and credit of the state be pledged for the payment of any such bonds, notes, certificates, or other evidence of indebtedness, unless such pledge shall be specifically authorized by the Legislature of Louisiana in the manner prescribed by the constitution of the state of Louisiana.
La. R.S. § 17:2186