La. Stat. tit. 56 § 1695
The assistant secretary, office of state parks, may issue upon application, to any citizen at a rate to be fixed by the office of state parks, a vehicle entrance permit to Louisiana state parks. The permit shall be a decal or other identification affixed to a private, non-commercial vehicle, and shall be valid for a period of one year, with the inception and expiration dates to be fixed by the office of state parks. The assistant secretary, office of state parks, may renew such permits annually, upon application therefor and upon payment for each renewal. Any citizen to whom a valid entrance permit has been issued shall, upon presentation of the permit, be exempt from paying the day use entrance fee to any state park in Louisiana. Any person accompanying a citizen having a valid entrance permit in the same single, private, non-commercial vehicle, shall be exempt from paying the general admission charge to any state park in Louisiana.
La. R.S. § 56:1695