§1. For a bishop conferring ordination by his own right to proceed to the ordination, he must be sure that the documents mentioned in can. 1050 are at hand and that, after the investigation has been conducted according to the norm of law, positive arguments have proven the suitability of the candidate.
§2. For a bishop to proceed to the ordination of someone who is not his subject, it is sufficient that the dimissorial letters mention that the same documents are at hand, that the investigation has been performed according to the norm of the law, and that the suitability of the candidate has been established. Moreover, if the candidate is a member of a religious institute or a society of apostolic life, the same letters must also attest that he has been received definitively into the institute or society and is a subject of the superior who gives the letters.
§3. If, all these notwithstanding, the bishop doubts for specific reasons whether a candidate is suitable to receive orders, he is not to promote him.
Source: Code of Canon Law (Vatican.va)