Your guess is as good as mine; perhaps better. I don't know, specifically, because I didn't ask him. But I do know someone in the area who claims that she knows of a witch's coven that sends people out, some of them men, to collect hosts at Catholic masses for their devil worship services. They don't use hosts that are not from Catholic churches.
She said that she was at one ceremony where they put about 50 or more hosts, some large, some medium or small, all on a table and spread out. Only one of them is from a Catholic mass, the rest are from other sources, but they all appear indistinguishable on a natural level. Then the lights are dimmed and chanting begins, and the procession of witches comes out from behind a curtain. They encircle the table and attempt to discover which one of the hosts is the "real" one.
The witch who is most physically upset at this time is always able to identify the true Host, because, she told me, she cannot stand to be in the presence of the "One Who Is."
Scary stuff...