Canon lawyer Dr. Edward Peters is always an interesting read. Here he has gathered together resources for the elucidation and interpretation of the canonical principles laid down in canon 915, concerning the refusal of Holy Communion:
"Those who have been excommunicated or interdicted after the imposition or declaration of the penalty and others obstinately persevering in manifest grave sin are not to be admitted to holy communion."
Rorate Mass in Milwaukee, Wisconsin, December 16th, 2017
50 minutes ago