Canon 763

The following are impeded from exercising sacred orders: (1) a

person who illegitimately received sacred orders while under an

impediment from receiving sacred orders; (2) a person who committed a crime or an act which is mentioned in can. 762, 1, nn.

2-6; (3) a person who is afflicted with insanity or with another

psychological illness which is mentioned in can. 762, 1, n. 1,

until the hierarch, after consultation with an expert, permits

the exercise of that sacred order.