Not SCLabs, vertical integration was originally touted as verboten though many companies advertise it. Testing for Vitamin E acetate is kind of trivial to add to a lab and many have been voluntarily adding it, the biggest hurdle was heavy metal testing that required labs to update their fume hoods.

The math is there but not for the reasons you'd think. Distillate is kind of like the 'hot dog' of cannabis and regulation falls more under food safety.

For full industrial cannabis or hemp production in facilities that process over 1,000 kilos per day of material, ethanol distillate is one of the only feasible methods for the process engineering involved. The absolutes can be obtained from most any source, including botched hydrocarbon extractions or just tossing the whole plants in. Even before these facilities there was probably about $3-7 of wholesale oil per cart.

Myclobutanil (a fungicide) which vaporizes into cyanide is one of the main suspected causes of EVALI (E-cigarette or Vaping Associated Lung Injury) along with vitamin E and MCT as cutting agents. Though a sample tainted with myclobutanil would be taken out of licensed circulation, it tends to make its way to the black market (see kushy punch raid).