Heavy Metals

Heavy metals testing on a cannabis COA covers lead, arsenic, cadmium, and mercury — metals the cannabis plant readily uptakes from contaminated soil and which can also leach from low-quality vape hardware. Hemp is a known phytoaccumulator, so heavy-metal testing is especially important for outdoor and greenhouse hemp grown on land with industrial history.

Example: Check heavy metals on outdoor hemp — the plant pulls them right out of the soil.

Etymology: Standard environmental-toxicology vocabulary.