All LP's must meet the requirements of the European pharmacopia for cannabis. It dictates the allowable limits, if you don't meet the requirements your crop fails and can't be sold. The pharmacopia is written by science and medical. All pharmaceuticals must pass. Being in the cannabis industry and on the inside of the MMPR side, there's no doubt in my mind that as far as sanitation and testing goes you can't beat LP cannabis. Quality on the other hand sux, but it's safe.
Ever been to a hydroponic store? That place is full of unregulated poisons you can buy for your gardens. LP's can't use a majority of the things you can buy at your local hydro shop. The only true way to know what's in your meds is to grow it yourself.
Itsme.
