[No.
They just grow it. By the millions.]
“What if some farmer grew his crop on the equivalent of a Superfund site, while using banned pesticides to keep the bugs at bay?”
If I were a pot smoker I would care.
It seems the state is trying to regulate that for the commercial growers, forcing every batch to be independently tested.
But the legal market is only about 10% of what’s produced.
Are you missing that people are allowed to grow six plants in their backyards?