Louisiana - R.S. 14:95. Illegal carrying of weapons is... (1) The intentional concealment of any firearm, or other instrumentality customarily used or intended for probable use as a dangerous weapon, on one's person; or (4) The manufacture, ownership, possession, custody or use of any switchblade knife, spring knife or other knife or similar instrument having a blade which may be automatically unfolded or extended from a handle by the manipulation of a button, switch, latch or similar contrivance... http://www.knife-expert.com