Non-Catholics at the Eucharistic Table

In Paul Turner's Blog by Paul Turner

Q. I know a set of Catholic parents who are trying to understand why the non-Catholic groom cannot receive communion at a Catholic wedding mass.  Is there a source you can recommend that cogently and simply explains why  the Roman Catholic Church does not welcome other Christian traditions to the Eucharistic table?

A. Here’s my own bulletin insert on the topic:
There are exceptions, as the same paragraph notes, but this wedding would not qualify.  I was able to obtain permission for an Episcopalian prisoner to receive communion at the Catholic mass while serving at Western Missouri Correctional Center in Cameron.  The Episcopalian had no other recourse to sacraments.