All vets have, at the very least, comprehensive education in biochemistry at undergraduate level. That goes without saying, and most will have further professional development in that area. The head vet was at least cited here if you actually bother to read the case. Dr. Molloy is particularly well informed in these areas.
[59] In his oral submission Dr Molloy drew the Committee’s attention to the NZTR “Advisement to Trainers” issued on 2 November 2018 which warned trainers of the possibility that race day boxes could be contaminated with human medications due to persons urinating in the boxes while on medication. Dr Molloy said this needed to be considered in the context that two persons not employed by the respondent but who were known to be using the same public stables as the Rae partnership had tested “non-negative” to methamphetamine.