The cannabis plant is known to be a hyper-accumulator of heavy metals in the soil and growing medium, so it’s critical to monitor levels to ensure cannabis products are safe to use. Unfortunately, there are many inconsistencies with heavy metal limits due to the lack of clear and common regulations. Most define four heavy metals (Lead, Arsenic, Cadmium, Mercury) while others specify up to nine. Some are based on limits directly in the cannabis plant, while others are based on human consumption per day. Others take into consideration the bodyweight of the consumer, while some other do not even have heavy metal limits. Some regulations only refer to heavy metals in the cannabis plant/flower, while some give different limits for the delivery method such as oral, inhalation, or transdermal.