. The diocesan bishop himself is competent to judge cases of the nullity of marriage with the briefer process whenever: 1° the petition is proposed by both spouses or by one of them, with the consent of the other; 2° circumstance of things and persons recur, with substantiating testimonies and records, which do not demand a more accurate inquiry or investigation, and which render the nullity manifest.
Source: Code of Canon Law (Vatican.va)