La. Public Health and Safety § 40:626
Publishers, radio broadcast licensees, television broadcast licensees, advertising agencies, and other agencies or mediums for dissemination of advertising do not violate the provisions of R.S. 40:625(C) by the dissemination of any false advertisement when the dissemination is caused by the manufacturer, packer, distributor, or seller who resides in Louisiana. However, the manufacturer, packer, distributor, or seller is amenable to the prosecution and penalties provided for the violations of that Subsection. No publisher, radio broadcast licensee, television broadcast licensee, advertising agency, or other agency or medium for the dissemination of advertising shall willfully refuse, on reasonable request of an officer or employee duly designated by the department, to furnish to the officer or employee the name and post office address of the manufacturer, packer, distributor, or seller, residing in Louisiana, who caused him to disseminate any such advertisement.
La. Public Health and Safety § 40:626