In an article in First Things entitled Fencing the Altar, Dr Peters writes:
Participation in Holy Communion is achieved by two related but distinct acts: the action of a member of the faithful in seeking Communion (reception) and the action of the minister in giving Communion (administration). These two actions are not only performed by different persons, they are governed by different canon laws. Virtually all confusion over Communion can be traced to the failure to keep these two actions distinct.It is worth reading as it helps minsters guard against over-zealous denial of the Holy Communion on the one hand as well as giving clear guidance on how to apply the law of the Church in this matter. There are public figures whom Peters has no doubt should be excluded by their bishops from Holy Communion.
I am much consoled by his line:
Difficult cases of law and fact will arise, and mistakes will inevitably be made in deciding them.for we do inevitably find ourselves in tight spots during the celebration of Mass and do not always get it right.