Much of the time it's just stuff I know (being a perverted cat in a back-asswards state has its advantages, thanks to the Internet!).  Other times, Tin Eye is a fairly good resource.  Unfortunately, it's becoming well known, so the fake girls are taking steps to circumvent the search engine.

The absolute best resource is when one of us shows up at the door to find a 200 pound gorilla--and then run like hell!  And then report it back here.  Sure hope ya'll use throw-away cell phones.

I am sure I have been wrong in the past. I think the best thing a person can do when they are looking for a provider and doing their research, is obvioiusly search TER and do the regular google searches, etc.

If you have been surfing around for TS girls any length of time and frequent Eros, TER, and a few of the other sites and then maybe watch a little TS Porn/VOD and you come across some amazing, hot, off the charts girl that you do not recognize and has an advertisement, apply some simple logic and ask yourself where did this girl come from?  How did she just pop up on day and be that smoking hot?  If you have doubts, I'd say you may be onto something.  Continue your research and decide if you will take one for the team or put on your running shoes and be ready to hit the road when  you see who answers the door.