In reply to Arachne during their conversation Vocis says (and this is a little disjointed but hopefully the gist is there):
"Discovering spies is certainly difficult without at least risking skirting parts of the peripheral code. I have been thinking on a similar topic and we have options."
"I was more concerned with the security of our materials in terms of stolen arcane connections than a mundane stealing our secrets until you raised this, but we should do something. I think a device to neutralise ACs is something worth investing in. "
"The library and our personal aides are a high risk areas and also have access to key resources. Frankly we as magi tend not to discuss secret matters outside ourselves so our notes and materials are a good attack method."
"We should also consider that we may have loyal companions and grogs who are easy to exploit magically. For example the Redcaps travel frequently and are protected by the code, but really do not have significant protection from scrying or Mentem investigation. It's a secondary consideration but still a useful vector."
"I am currently looking at scrying options, scrying defenses, and how to craft deployable scrying assets. I was considering how to build a scrying network."
"Using a direct Mentem spell on our inhabitants discreetly is distasteful to me, but it is the best option to find a spy. An enchantment on a gateway will do that well. Or we cast directly. I could work in that direction too if we agree that is the path forward. "
"Otherwise watching our covenfolk for odd behaviour is the best option and we should use both magical and mundane means."
OCC - I assume as it was asked directly of Vocis that Rich wasn't there for the conversation.