La. Stat. tit. 37 § 214
Except as provided in this Section, no person licensed or qualified to practice as an attorney at law or as an attorney and counsellor at law in any other state and temporarily present in this state shall practice law in this state, unless he has been first duly licensed to practice law by the supreme court of this state or unless he acts in association with some attorney duly licensed to practice law by the supreme court of this state.
Nothing in this Chapter prevents the practice of law in this state by a visiting attorney from a state which, either by statute or by some rule of practice accorded specific recognition by the highest court of that state, has adopted a rule of reciprocity that permits an attorney duly licensed and qualified to practice law in this state to appear alone as an attorney in all courts of record in the other state, without being required to be admitted to practice in such other state, and without being required to associate with himself some attorney admitted to practice in the other state.
Whoever violates any provision of this Section shall be fined not more than one thousand dollars or imprisoned for not more than two years, or both.
La. R.S. § 37:214