Even though the root doesn’t contain THC, consider the value of the roots, they contain the cannabinoid precursor to THC, CBD, etc., known as olivetolic acid. It travels through the lymphatic system when applied topically. The route taken through the lymphatic system is very different from the path that is taken by THC, CBD, etc.
Cannabinoid production starts when an enzyme causes geranyl pyrophosphate and olivetolic acid to combine and form CBG, which stay lodged in the root system while the TCH departs and travels up through the plant. The effect is caused by the geranyl pyrophosphate and olivetolic acid and has a HUGE potential for benefiting MMJ patients.