The drugs are regulated so that people can't cut them with other substances, right? I thought that was what Damien was explaining.

Now what interests me is that the drug that kid was on apparently allowed him to see the fae? Or was the kid an adept or sorcerer to begin with and was using the drug to power him up?

I'm not sure Gerald usually lets people see both sides of the medallion. If one side is the sigil of Jehanna and the other is the Earth disc then he can pick and choose. But it's pretty interesting that he of all people has the Earth disc on there to begin with, isn't it? He doesn't exactly hang with many religious types these days. It would be useful for soothing tense Church-goers, but how often does he encounter those?

We don't know that Gerald hasn't built a generator, do we? :D Who knows what all he has stashed in the basement of the keep.