Drying rooms should be cool and dry, preferably in uninterrupted darkness. Cannabis, like corn flakes, is sold by weight, not volume. Tobacco farmers also allow their product to gain weight by reabsorbing moisture before sale. Recently purchased products should be redried. Freezer storage will not protect damp pot.
Insecticides have no application in stored marijuana.
Their residue pose a danger to customers. But they leave residues in air pockets of fumigated material. Big buds are full of air pockets. Poisons are very useful for disinfecting drying rooms, but only after the crop has been cleared out. However, with rewarming, many bugs continue their destruction.