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As I have come to believe that taking Holy Communion to the homebound and sick is one of the few valid uses of Extraordinary Ministers I had actually assumed this particular issue had already been anticipated and had guidelines in place.
I guess I assumed wrong.
The problem is that you are assuming that something like the USCCB or the Vatican could come up with policies that would be nationwide or throughout the church. The fact is that the individual polices need to be adopted by the parish/diocese. If there was a universal policy the same things that apply to a remote parish in Africa would have to apply to the same parish in inner city New York.
Whether you can return the host to the tabernacle would vary in each of those situations. It is up to diocesan training to let people know what the policies are and to make sure they are being followed. If there are questions about a practice they should be asked to the appropriate people. If a parish is doing things that sound questionable, it should be brought up with the pastor then the bishop.
It is a pretty much universal norm that an EMHC should be only taking as many hosts as necessary and returning them to the tabernacle if possible. What happens in cases where the above can’t happen would depend on the parish. Like I said earlier my parish has numerous options when that happens, not all parishes do.
Training is very important in this but like I said before, not everything can be taught or legislated. In the course of years I have encountered the following and was not told what to do in training. What would you do in the following (more just to think about then actually answer)
a) Patient in hospital offers you large donation.
b) In isolation ward with virus contamination issues, patient spits out host.
c) How to even approach a person in an isolation ward whether they be there for issues related to danger of them being contaminated or you/others being contaminated.
d) In mental health ward, patient keeps talking about visions of Christ telling him to do bad things
e) In mental health ward, patient talks about visions that may or may not be valid.
f) Dealing with patients of different faiths.
None of those things ever came up in training but had to be dealt with. Also note that is just a small sampling of where the EMHC has to think on their feet.