La. Stat. tit. 37 § 215
Whenever any visiting attorney desires to exercise the privilege of appearing alone as counsel of record in any case in any court of record in this state, under the provisions of the second paragraph of R.S. 37:214, he shall, before filing the first pleading or other appearance on behalf of his client in the cause, produce evidence satisfactory to the court before which he wishes to appear, or to the presiding judge if there be two or more judges of the court, to the effect that the state in which he is then licensed and qualified to practice law has in force a statute or rule of practice of the character specified in R.S. 37:214. Upon the judge being satisfied of this, he shall enter an order authorizing the appearance of the visiting attorney before his court in the case. This order shall specifically refer to the appropriate statutory provision or to the requisite judicial recognition of the appropriate rule of practice of the other state in question.
La. R.S. § 37:215