La. Revenue and Taxation § 47:338.100
Said additional sales tax shall be in addition to all other taxes authorized to be imposed in the parish by the said governing authority, including, but not by way of limitation, the sales tax which is presently being levied by authority of R.S. 47:338.85, and said additional sales tax shall be administered and collected by the governing authority in accordance with the provisions hereof in the manner and pursuant to the definitions, practices and procedures set forth in R.S. 47:301 through 317, insofar as practicable. The governing authority may, if it so desires, collect the said additional sales tax in conjunction with the one-half of one per cent sales and use tax which is presently being levied and collected in the parish by the said governing authority in accordance with the provisions of R.S. 47:338.85.
La. Revenue and Taxation § 47:338.100