Canon 16
§1 Laws are authentically interpreted by the legislator [typically the Ordinary] and by that person to whom the legislator entrusts the power of authentic interpretation [typically a judicial vicar].
Hello,
Perhaps some definitions/citations will help. Diocesan Bishops are legislators (either individually or collectively). The Supreme authority in the Church can delegate legislative authority to another but no one else can delegate this power (c. 135.2). So, for example, the bishop of Bardstown cannot delegate his legislative authority to his Vicar General. In issuing laws/decrees/instructions, a lower legislator/executor is obliged to obey the laws issued by the higher authority (cf. ibid., c. 33.1, 34.2)
“Ordinary” is not equivalent to the diocesan bishop. I do hear, from time to time, people refer to a diocesan bishop as “the Ordinary of the diocese of such-and-such.” Well, a diocese has at least two “ordinaries”: the diocesan bishop and the vicar general (c. 134.1). Episcopal vicars are also “ordinaries.” A legislator, in a diocese, can never be a vicar general or episcopal vicar (see c. 391.2).
A judicial vicar is the one who acts as a Judge in place of the diocesan bishop. He handles trials (see cc. 13135.3, 1420). I suppose a bishop could tell his judicial vicar to also “interpret” diocesan law but that would not be done as judicial vicar. Interpretation of law is a matter of executive authority, not judicial.
Regarding “interpreting” canon law: a diocesan bishop is not entrusted with the authority to interpret the Code of Canon Law (c. 16). That function is entrusted to the Pontifical Council for Legislative Texts (see Pastor bonus, art. 154ff). As mentioned, a bishop can certainly “interpret” the particular law of his own diocese, either personally or through another.
A diocesan bishop can dispense from universal, disciplinary laws (c. 87). The Code contains many laws which are not subject to dispensation by the bishop (penal law, procedural law, constitutive law…cc. 86, 87).
Bishops are certainly obliged to implement universal law and, where possible, specify how it is to be observed: in other words, bishops must obey the law (see c. 392).
Dan