Wow! What a rabbit hole you just sent me down. And look what I found:
The TD2021NA document (written on May 20, 2021) had an effective date of June 1, 2021, so CAS may have referenced the wrong document and therefore the wrong procedures, but it's complicated because here's the timeline:
Dec 15, 2020 sample collected.
Jan 14, 2021 athlete notified.
May 18, 2021 request for arbitration from World Athletics.
June 11, 2021 CAS decision made I think.
Conveniently changing the rules?
The TD2019NA document says isotopic signature of -20 to -24% is inconclusive origin, and her A and B samples were 23.1 and 23.0% The references 1 and 2 seem to go to dead links on WADA's web site that now forward to general info. Deleted?
Is there anything in the literature that confirms or disputes Professor Ayotte's claim that the nor-DHEA precursor would produce 19-NA metabolite with -23.7% and that nandrolone injectables would produce 23.6%? Did she make up fake numbers? It looks like 19-nor-DHEA is a derivative and not a precursor of nandrolone.
This paper shows several synthetic sources at around -29% for 19-NA in urine:
https://pubmed.ncbi.nlm.nih.gov/21236283/That includes injectable nandrolone and also oral precursors.
It does show 1 female subject at -24.9% naturally, I think.
I could not find anything on nor-DHEA while searching that and the full name in PubMed.
Did Professor Ayotte not publish the work that she mentioned? Is nor-DHEA the same as 19-nor-DHEA? That could explain why there's no research on it as a precursor to nandrolone and 19-NA if it's actually a derivative of nandrolone. What the hell happened? Somebody mentioned that the same professor was shown to be untruthful in a prior case. Did that happen here?
Randomly found this too:
https://pubmed.ncbi.nlm.nih.gov/10861987/But if the positive test came from Professor Ayotte's lab, can we even believe those numbers? Maybe Houlihan never really tested positive.
If anybody wants to help figure this out...