[101.] In order for Holy Communion under both kinds to be administered to the lay members of Christ’s faithful, due consideration should be given to the circumstances, as judged first of all by the diocesan Bishop. It is to be completely excluded where even a small danger exists of the sacred species being profaned.
[187] With a view to wider co-ordination, the Bishops’ Conferences should issue norms, once their decisions have received the
recognitio of the Apostolic See through the Congregation for Divine Worship and the Discipline of the Sacraments, especially as regards “the manner of distributing Holy Communion to the faithful under both kinds, and the faculty for its extension”.
[188]
[102.] The chalice should not be ministered to lay members of Christ’s faithful where there is such a large number of communicants
[189]that it is difficult to gauge the amount of wine for the Eucharist and there is a danger that “more than a reasonable quantity of the Blood of Christ remain to be consumed at the end of the celebration”.
[190] The same is true wherever access to the chalice would be difficult to arrange, or where such a large amount of wine would be required that its certain provenance and quality could only be known with difficulty, or wherever there is not an adequate number of sacred ministers or extraordinary ministers of Holy Communion with proper formation, or where a notable part of the people continues to prefer not to approach the chalice for various reasons, so that the sign of unity would in some sense be negated.