It sounds like the CO growers you're familiar with are not very sophisticated. It seems relatively simple and cost-effective for commercial operations to store herbal material sealed in inert atmosphere (N or CO2) in freezers, avoiding all new microbial growth and other contamination (insects, mice, etc.) and also largely stopping chemical breakdown of cannabinoids and terpenes.Great in theory, not so much in reality.
Speaking only for Colorado; there's typically a "shelf life" that you're allowed to store products for, set up by regulation. There was a rule change recently where flower can't be stored for longer than 1 year in Colorado, which you'd be surprised how many grows had 3+ year old flower (that are stored in plastic totes with no humidity controls. Boone Farm actually used tortillas in their flower bins lol (you can't do that, they got nailed with fines for it.)
2nd, there's regulations for products that are moldy/defective, that usually involves retesting them several times, which gets to be ungodly expensive. If flower fails for pathogens in Colorado, it has to be retested THREE TIMES. That's actually a big reason why many farms don't produce a variety of cultivars, because every single one is subject to the same testing regulations.
If a product is found in a dispensary to be moldy or contaminated, they will recall the entire batch. The dispensary is also likely to send the product back to the farm (a lot of sales are done on consignment.)
It's likely cheaper to just run a new batch than it is trying to scrape the mold off the top.
I presume the problems you cite with heavy metals (or other chemical) and mold contamination are mostly with outdoor grows? [But how does that even happen to commercial scale legal growers, who can better control soil/media, nutrients, water, etc.?]
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