Yes, but I think not if the substance is bio-identical.
https://www.wada-ama.org/en/resources/scientific-research/novel-approach-detect-and-identify-low-abundant-long-term-metabolites
I didn't read or research but "regular" synthetic testosterone you get at the pharmacy is called "bioidentical." And that is detected by isotope testing. I don't know if you can synthetically make test with the correct isotope, or if you'd have to extract it from human urine or whatever, but I have never seen mention of truly bioidentical test being made or sold anywhere. Patrick Arnold didn't have it. But if I were to guess it's probably possible to manufacture or extract somehow... someone should look it up, I'm too lazy right now. But even then doping would be plenty hard I think as they would see levels are abnormally high and lutenizing hormone is suppressed and so on. That's why they have the "biological passports," where they monitor fluctuations and not just outright abnormal numbers. Like high test after races when they should normally drop, or coming in to comps always with topped out red blood cells. There are for sure real doping evading experts out there but they are not writing on the net, for the most part.
Like I said earlier, I think a lot of doping today is done with substances not currently banned. Like that Alex Kikel fella says Melanotan II is not banned but improves hematology. I don't know if true but that's what he claims. WADA is monitoring a bunch of drugs not on the lists, when they see everyone have a certain legal drug in their system they take notice.
GH seems easy to detects. Normally your body secretes several forms of GH, not just the 20 or 22kda isoform or whatever you can supplement exogenously. Maybe cadaver derived would get around this, I don't know. Alex Kikel says China does manufacture these other forms though, some of which are not on the banned lists.
