Hemp is a strain of the cannabis plant used in many industrial applications & as a food source, it differs from recreational cannabis drug use in that the strain has little amounts of the active compound that gets you high THC. So just as a human is not an ape, hemp is not sativa.
Even at that the hemp powder would be the isolated protein from the plant, it wouldn't be the plant ground up into powder form. Just like sugar does not contain the fibers/vitamins of the cane it comes from.
Hemp is a popular protein powder used in shakes and smoothies and also a milk substitute. It has a great nutritional range rich in omegas & amino acids. It is perfectly fine to use & will not show up in drug tests or have any side effects like smoking weed as it DOES NOT contain THC which gets you stoned. So yes you can lick the soap LOL
My Hippie Soaps are made using hemp seed oil base and sometimes powder, the oil helps balance dry skin and is anti-ageing, its absorbed easily into the skin, has anti-oxidant and moisture balancing properties and combats skin irritations.
Hemp soap also contains hemp seed powder which acts as a mild exfoliator giving your skin a youthful glow.
So there now you know this has been HEMP 101 :)