P.R. Laws tit. 34, § 1755
If it appears on the return of the writ that the prisoner is in custody by virtue of process from any court of Puerto Rico, or judge, or officer thereof, such prisoner may be discharged in any of the following cases, subject to the restrictions of § 1754 of this title:
(1) When the jurisdiction of such court or officer has been exceeded.
(2) When the imprisonment was at first lawful, yet by some act, omission, or event which has taken place afterwards, the party has become entitled to a discharge.
(3) When the process is defective in some matter of substance required by law rendering such process void.
(4) When the process, though proper in form, has been issued in a case not allowed by law.
(5) When the person having custody of the prisoner is not the person allowed by law to detain him.
(6) Where the process is not authorized by any order, judgment, or decree of any court, nor by any provision of law.
(7) Where a party has been committed on a criminal charge without reasonable or probable cause.
History —Code Crim. Proc., 1935, § 483.