La. Code Civ. Proc. art. 1431
If the court is satisfied that the perpetuation of the testimony may prevent a failure or delay of justice, it shall make an order designating or describing the persons whose depositions may be taken and specifying the subject matter of the examination and whether the depositions shall be taken upon oral examination or written interrogatories. The depositions may then be taken in accordance with this Chapter; and the court may make orders of the character provided for by Articles 1461 through 1465. For the purpose of applying the provisions of this Chapter to depositions for perpetuating testimony, each reference therein to the court in which the action is pending shall be deemed to refer to the court in which the petition for such deposition was filed.
La. C.P. § 1431