What is the protocol for pastor's visitation?

There is a resident or visiting chaplain at every detention facility. You may call the main number and request to speak to the chaplain. They are usually very good at giving time to concerned family and friends. Normal visitation will usually cover a pastor's visit. The only time it is considered a "special visit" is if there was some sort of family emergency and the pastor would need to deliver news to the inmate in person. That may be arranged with the unit secretary or the warden's office (and maybe with the assistance of the chaplain).