It's the jail system, cops and their union, the insurance companies, drug testing facilities, and the labs.
I've been doing randoms for almst 10 years now and and at almost $200.00 a test, this is a huge burden on companies.
We have had several accidents over the years and NOT ONCE did anyone come up positive while being treated.
As everyone knows, pot is the only thing they usually catch. We have our "Lottery" at the beginning of every month. I could do meth week 2-4 and never get caught.
Big Pharma + Politicians + Law Enforcement = A giant money grab.
EDIT- I forgot to include the fact that everytime we have an accident, we must send more people to be tested every month, even if they were clean when they were injured. Now that really tells you something IMO.