La. R.S. 33:9032

A local governmental subdivision may issue revenue bonds payable solely from tax increments, in an amount to be determined by the local governmental subdivision to finance or refinance an economic development project or any part thereof or to pay all or a portion of the costs of an economic development project as described in R.S. 33:9035. A tax increment shall consist of that portion of the ad valorem tax revenues for any or all taxing authorities collected each year from property located within an economic development area which exceeds the revenues that would be collected for such taxing authorities if such property were assessed at its value as of the year immediately prior to the year in which the area was designated as an economic development area. Such revenue bonds may be issued only after the local governmental subdivision has called a special election submitting the proposition for the issuance of the bonds to the qualified electors of the local governmental subdivision and has received the favorable vote of a majority of the electors. Dedication of tax increments to pay the revenue bonds shall not impair existing obligations and shall not include tax revenues previously dedicated for a special purpose.