Canon 1469

Can. 1469 §1. A judge expelled by force from his territory or impeded from the exercise of jurisdiction there can exercise jurisdiction and render a sentence outside that territory; the diocesan bishop, however, is to be informed of this.

Can. 1469 §2. In addition to the case mentioned in §1, for a just cause and after having heard the parties, the judge can also go outside the territory to acquire proofs. This is to be done, however, with the permission of the diocesan bishop of the place where the judge goes and in the location designated by that bishop.