I've been pretty much staying out of this one because I don't know much about steroid testing, but these latest comments kind of chap my ass.
Santa calling somebody a dirty cop, worse than the criminals, because he chooses to put a chemical into his body is ridiculous. You should be bitch slapped for that nonsense.
But enough of that. OP the sense that I get from all your posts is that you are grasping at straws. You want to split hairs on one thing being detectable while another is not. Trying to dig a bit deeper than the situation allows. My take is that if an interested party wanted to catch you, and had probable cause, then they would catch you. Don't think you can avoid it.
You've read about the epi-tesosterone testing, and the carbon-13 vs carbon-12 thing. If somebody wants to know, then they can find out. Same applies for all 19-nors like deca, NPP, tren - easy as pie to detect via common metabolites. I don't know, but I assume same applies to lots of other common roids like dbol, and all the DHT derived family.
For a great reference search up "Steroid Detection Times" by Dan Chaiet. If you type steroid urine testing 19-nor in yahoo it is the first link that comes up.
Now what that means to me is if you want to dabble and are pretty sure you will be tested, then the only thing you can do is testosterone and make sure you get a TRT script from a legit source. That should clear you of any trouble, but keep in mind if they really want to know, then they can - and there is nothing you can do to avoid it.