Louisiana Revised Code 14:95 and Louisiana Revised Code 40:1796 work together, in concert, to bar any such action by St. Helena Parish.
However, St. Helena Parish may, in accordance with Louisiana Revised Code 40:1796, regulate Firearms by:
1. Acquiring the proper Taxes levied against them [Firearms] for certain matters,
2. Pass a Local Ordinance prohibiting Firearms in certain Commercial Establishments (I assume Commercial Establishment means any Bar or Restaurant, under Louisiana Revised Code 14:95.5) and Public Buildings, and
3. Securing the inventory of Firearms and Ammunition from Federal Firearms Dealers in 'High Risk' Parishes. (St. Helena Parish is not a 'High Risk' Parish for the purposes of this Code, however).
Firearms are Legal in Parks in Louisiana, as there is no Law against it, so as long as the Firearm is not within a 1000 feet of any School, under Louisiana Revised Code 14:95.2, unless an exception under Louisiana Revised Code 14:95.2(B) applies.
***Although no Revised Statutes exsist making it a Crime to Carry a Firearm into StateParks, there are, however, Administrative Codes against this practice. However, Revised Code may or may not trump Administrative Code in this instance. Therefore, consult with an Attorney beforeany action is taken in this area. It issafe, however, to Carry a Firearm into a Localor Parish Park, in light of Louisiana Revised Statute40:1796.***
***LouisiananWMA Mananged Lands are off-limits to Firearms per Louisiana Revised Statute 56:109(C), unless; an exception applies as spelled out under Louisiana Revised Statute 56:109(D)(1) throughRS 56:109(5)(b).***