P.R. Laws Ap. tit. 34A, § II, Rule 231
A search warrant shall not be issued except upon a written statement, made before a magistrate under oath or affirmation, which shall set forth the facts tending to establish the grounds for the issuance. If from the affidavit and the examination of the affiant, the magistrate is satisfied that there is probable cause for the search, he shall issue the warrant, naming or describing particularly the person or place to be searched and the things or property to be seized. The warrant shall state the grounds for its issuance and the names of the persons on whose affidavits the warrant is based. It shall order the officer to whom it is directed to forthwith search the person or place named for the property specified, and to make a return of the service of the warrant to the magistrate, together with the property seized. The warrant shall direct that it be served in the daytime, but the magistrate, by reason of necessity and urgency, may direct that it be served at any time of the day or night.