I can't say for other states, but I can say in Washington their is Def some shady stuff going on. Currently they require testing for every 5 pound lot and as of today they only require THC and cannabis testing and like mold and fecal material bacteria.
It is changing soon, the LCB will be requiring pesticide/contaminant testing. I have heard , 3rd party info, that their are farms worried because it was an honor system, the LCB only tested for products that farms reported using...
So if a farm doesn't report that they sprayed pyganic or nukem or even something not on the approved list. Then no one will know. LCB does do random testing from samples in dispensaries but since covid any physical presence by the LCB has been reduced, so they are not doing as much random which is why they are now requiring full pesticide screen with the THC/cannabanoid
Honor system only works when people are trying to work within the rules/laws