La. Code Crim. Proc. art. 438
Current with operative changes from the 2024 Third Special Legislative Session
If a grand juror knows or has reason to believe that an offense triable by the district court of the parish has been committed, he shall declare such fact to his fellow jurors, who may investigate it. In such investigation or any subsequent criminal proceeding the grand juror shall be a competent witness.
La. Cr.P. § 438