Bet it was the ERT or The Florida Association of HazMat Responders and not the NRT they called in because it's an isolated case.
The Environmental Response Team (ERT) is a DEP founded team whose members are from different state and county organizations from around Florida. Members volunteer to be a part of the team but are selected for their capabilities.
ERT provides technical assistance as well as investigative and forensic sampling support at an event in which an environmental pollution incident or public health threat, outlined under Chapters 403 and 376, Florida Statutes, has occurred.
A request for the team’s deployment may come from local fire departments, the State Watch Office, Regional Domestic Security Task Force, local emergency management directors, or other state and federal agencies.
Also a news article mentioned: "The substance contains a large amount of Dihydrogen Monoxide, a chemical used in the production of Oxycodone and Methodone. (Note: Dihydrogen Monoxide is deadly if inhaled in large enough quantities)"
but:
So maybe they missed a substance that caused the smell or the victim is exaggerating or, as it was going on for months, the phd student used (a) different substance(s) earlier on that caused the symptoms and he changed tactics by using the latter substances later on so when they tested the area the earlier used substances weren't present enough anymore to be detected?
Maybe someone can find that FBI report.
Ahem. "Dihydrogen monoxide" and "hydric acid" are just other terms for "water".
So I hope you were intending a satire post.