La. Code Crim. Proc. art. 741
Current with changes from the 2024 First and Second Extraordinary Sessions
If a person in any state, which by its laws has made provision for commanding persons within its borders to attend and testify in criminal prosecutions or grand jury investigations commenced or about to commence in this state, is a material witness in a prosecution pending in a court of record in this state, or in a grand jury investigation which has commenced or is about to commence, a judge of such court may issue a certificate under the seal of the court stating these facts and specifying the number of days the witness shall be required. This certificate shall be presented to a judge of a court of record in the county (parish) in which the witness is found.
La. Cr.P. § 741