Industrial Hemp and marijuana are both plants of the Cannabis Sativa L. genus. They have almost identical chemical makeup, but the key difference is how much CBD and THC they have. Marijuana has naturally occurring high amounts of the psychoactive THC  and low amounts of non-psychoactive CBD. Industrial hemp has very high levels of CBD, and very low amounts of THC. When hemp is processed, the levels of THC are further reduced to below the legal .3% which is negligible and has no psychoactive effects at this level. Only industrial hemp and its products are legal in all 50 states.