I'd tell you that I don't trust a magical communication device till I'm sure I know who it communicates to.

[Paranoia? Possibly, but Roy has to consider this sort of thing in making his plans. He is, essentially, taking responsibility for everyone who has been brought here in doing this; the last thing he wants is to endanger anyone without preparation.]

Beyond catching someone cackling to themselves and delivering a villainous monologue, though, I'm not sure what proof we could find either way.