According to Canon Law, the onus to exclude unrepentant grave sinners from Communion lies both with the minister of the Eucharist (person who distributes Communion) and with the offenders themselves.
Can. 915 Those upon whom the penalty of excommunication or interdict has been imposed or declared, and others who obstinately persist in manifest grave sin, are not to be admitted to holy communion.Can. 916 Anyone who is conscious of grave sin may not celebrate Mass or receive the Body of the Lord without previously having been to sacramental confession, unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition, which includes the resolve to go to confession as soon as possible.
That's Canon Law as it stands.
The utter failure to preach 916 and to enforce 915 is at the root of the dirty rotten scandal which is corrupting the souls of laity and clergy alike.
Good doctrine, bad (or no) disciple.
If it is gravely imputable by reason of malice or negligence, willingly done by a person 16 or over, or not disqualified by other clauses. But which excommunication is effectively meaningless since the one basic duty of RCs is to follow the pastors, and who give the interpretation of RC teaching by what they say and do, and Rome has clearly shown that she does not consider even proabortion, prosodomite pols and their known supports to be excommunicated.
The other alternative is to be as evangelicals which they criticize for ascertaining the veracity of what is taught by examination of the warrant for it, resulting in the factions in Catholicism thereby rather than following the reigning leadership, which papal teaching admonishes them to do.
According to Canon Law, the onus to exclude unrepentant grave sinners from Communion lies both with the minister of the Eucharist (person who distributes Communion) and with the offenders themselves. Can. 915 Those upon whom the penalty of excommunication or interdict has been imposed or declared, and others who obstinately persist in manifest grave sin, are not to be admitted to holy communion. Can. 916 Anyone who is conscious of grave sin may not celebrate Mass or receive the Body of the Lord without previously having been to sacramental confession, unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition, which includes the resolve to go to confession as soon as possible. That's Canon Law as it stands. The utter failure to preach 916 and to enforce 915 is at the root of the dirty rotten scandal which is corrupting the souls of laity and clergy alike. Good doctrine, bad (or no) disciple
But which is subject to interpretation, and your interpretation contradicts that of leaders such as cardinals as Wuerl:
I stand with the great majority of American bishops and bishops around the world in saying this canon [Canon 915] was never intended to be used this way.'' -- http://www.canonlaw.info/2009/03/abps-wuerl-c-916-burke-cc-915-916-on.html
Moreover, Canon lawyer Edward Peters offers a rule of thumb for the interpretation of Canon 915, which stipulates that the Eucharist should not be administered to those who have been excommunicated “and others who obstinately persist in manifest grave sin.”
Unless a substantial majority of the community in question (I’m assuming them to be adults, reasonably aware of Catholic life around them, etc.) knows at the time why a given individual is being denied holy Communion, that’s a pretty good sign that Canon 915 has not been satisfied, and that Canon 912 (and some others norms) has been violated. - http://www.catholicculture.org/commentary/otn.cfm?id=897
And while Canon 1184 forbids - unless they gave some signs of repentance before death (which also is subject to interpretation), ecclesiastical funerals to "notorious apostates, heretics, and schismatics.." "manifest sinners who cannot be granted ecclesiastical funerals without public scandal of the faithful," yet §2. "If any doubt occurs, the local ordinary is to be consulted, and his judgment must be followed." And the local ordinary, no doubt with Ratzinger's knowledge, gave Teddy K and like anti-Christ pols ecclesiastical funerals, and which effectually conveys to the flock how canon law is to be understood, and again to which they are to look.
It follows that the Church is essentially an unequal society, that is, a society comprising two categories of per sons, the Pastors and the flock...the one duty of the multitude is to allow themselves to be led, and, like a docile flock, to follow the Pastors. - VEHEMENTER NOS, an Encyclical of Pope Pius X promulgated on February 11, 1906.
And to scrutinize the actions of a bishop, to criticize them, does not belong to individual Catholics, but concerns only those who, in the sacred hierarchy, have a superior power; above all, it concerns the Supreme Pontiff, for it is to him that Christ confided the care of feeding not only all the lambs, but even the sheep [cf. John 21:17]. - Est Sane Molestum (1888) Apostolic Letter of Pope Leo XIII
To the shepherds alone was given all power to teach, to judge, to direct; on the faithful was imposed the duty of following their teaching, of submitting with docility to their judgment, and of allowing themselves to be governed, corrected, and guided by them in the way of salvation. Thus, it is an absolute necessity for the simple faithful to submit in mind and heart to their own pastors , and for the latter to submit with them to the Head and Supreme Pastor....
Similarly, it is to give proof of a submission which is far from sincere to set up some kind of opposition between one Pontiff and another. Those who, faced with two differing directives, reject the present one to hold to the past, are not giving proof of obedience to the authority which has the right and duty to guide them; and in some ways they resemble those who, on receiving a condemnation, would wish to appeal to a future council, or to a Pope who is better informed.
On this point what must be remembered is that in the government of the Church, except for the essential duties imposed on all Pontiffs by their apostolic office, each of them can adopt the attitude which he judges best according to times and circumstances. Of this he alone is the judge. It is true that for this he has not only special lights, but still more the knowledge of the needs and conditions of the whole of Christendom, for which, it is fitting, his apostolic care must provide. - Epistola Tua (1885), Apostolic Letter of Pope Leo XIII; http://novusordowatch.org/leo13-epistola-tua/