§1. Before candidates are admitted to the novitiate, they must show proof of baptism, confirmation, and free status.
§2. If it concerns the admission of clerics or those who had been admitted in another institute of consecrated life, in a society of apostolic life, or in a seminary, there is additionally required the testimony of, respectively, the local ordinary, the major superior of the institute or society, or the rector of the seminary.
§3. Proper law can require other proof about the requisite suitability of candidates and freedom from impediments.
§4. Superiors can also seek other information, even under secrecy, if it seems necessary to them. Art. 2.
Source: Code of Canon Law (Vatican.va)