If it erases memories, we wouldn't remember whether we'd been affected, would we?

[She ponders for just a moment.]

Catching whoever's responsible in the act would be useful for all sorts of reasons, but it seems less likely now that we've confiscated the herbs. Unless, of course, there are more out there. And ideally we would catch them before they were actively tampering with anyone's memory.

I'll keep you apprised if we do, though I have got a few techniques myself. [She's talking about interrogation techniques.]