Even if a Catholic accepts that Ambrose Moran, who claims to be a Catholic, was consecrated a bishop by an Orthodox bishop and not by a Catholic bishop, he must keep in mind that when it comes to individual cases, he must take the safest approach before receiving the sacraments from him lest he commits the sin of sacrilege. I wrote about the validity of Orthodox orders here. In summary of that post, Ambrose Moran’s consecration by an Orthodox bishop must be investigated by the competent Church authorities to determine the validity of that consecration. Fr. Joseph Pfeiffer is not a competent authority to conduct such an investigation, especially given that he has a vested interested in proving that Ambrose Moran’s consecration was indeed valid. No. Until the competent Church authorities investigate the case of Ambrose Moran, if they ever do, a Catholic must treat Ambrose Moran as a layman.
The September 2007 issue of The Angelus has a good article on page 27 titled “Ought Priests of the Conciliar Church to Be ‘Re-ordained’ When They Come to Tradition”. The portion of that article that applies to this post is #2, which reads as such:
Therefore, even if a Catholic believes that a sacrament is probably valid, he must not receive that sacrament. Otherwise, he commits a sacrilege. One must have a moral certitude that the sacrament is valid before receiving it. Since Ambrose Moran was ordained and consecrated by an Orthodox bishop(s) and not by a Catholic bishop, one cannot have a moral certitude regarding the validity of his priestly or episcopal orders. Therefore, one must not receive the sacraments from him unless the competent Church authorities investigate and determine that his orders are indeed valid.