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Guest
I wonder why we have Canon Law and rubrics then? 
In most cases, yes.[64.] The homily, which is given in the course of the celebration of Holy Mass and is a part of the Liturgy itself, āshould ordinarily be given by the Priest celebrant himself. He may entrust it to a concelebrating Priest or occasionally, according to circumstances, to a Deacon, but never to a layperson. In particular cases and for a just cause, the homily may even be given by a Bishop or a Priest who is present at the celebration but cannot concelebrateā.
There is, however, a special case when a layperson is allowed to give a āreflectionā in place of the homily. The document above specifically speaks to the celebrant giving a layperson permission to give the homily. This is correct, he cannot do that. The Ordinary, whether it is the Bishop of the diocese or the Father General of an Order of Pontifical Rite within a chapel of a religious house, can give this dispensation to a layman (or laywoman). It is usually done in cases of seminarians preparing for the priesthood but have not yet been ordained to the deaconate. Our Father General, as our Ordinary, sometimes gives brothers this permission within our chapels because deaconate is held off until after Solemn Profession, which takes place after graduation from seminary, and the practice during Mass is required for their Preaching course as most of their classmates are already deacons. Technically, this permission may also be given to a woman.