http://www.laopera.com/

Sorry about posting something mostly unrelated but it seemed better to post it in a slightly related thread.

Who came up with the idea that EPC agents might have slipped across into HQ during the last shields breach, and can I have permission to consider using that as a story element?

I guess a shibboleth, something that natives of wherever they claim were fleeing from can pronounce well, but 'almost' no one else could.

Most often searches are the best way. Anything that could be seen as a recording device, maybe even pen and paper if if you want your factions to be that mad, can be used as evidence. But then, a good spy will never bring whatever that could incriminate him, but he may have a sign that was planted by his nation/order before he take the mission, and as such, can't be foolproof against naked body search.