How do you spot feds in your ranks?

Disclaimer: I use "fed" as a catch-all term for infiltrators, law enforcement in general, intelligence agencies, sleeper agents, and masqueradors depending on context. In this post I mean people who pretend to be Xenogenders to spread transphobia.

This is one concern I still have left unanswered since I struggle to spot the difference between actual xenogenders and reactionary feds.