La. Stat. tit. 3 § 4681
The commissioner is authorized to prescribe reasonable rules and regulations and to employ the necessary methods for the proper testing and analyzing of all petroleum products sold or distributed for sale, use, or consumption in the state. To that end he is given all the power and authority conferred under this Chapter. All testing and analyzing shall be done in accordance with the procedures established by regulations adopted by the commissioner. The procedures adopted by the commissioner shall be based upon the procedures and standards established by the American Society for Testing and Materials, their successors, or any other federal or nonprofit agency that prepares and issues nationally recognized standards for weights, measures, and weighing and measuring devices or nationally recognized standards for establishing octane, volatility, and other requirements for petroleum products.
La. R.S. § 3:4681