As of December 2018, Hemp is federally legal to grow again in the United States. The government passed the Hemp Farming Act of 2018, part of the 2018 Farm Bill signed by President Donald Trump on 20 December 2018. This bill changed hemp from a controlled substance to an agricultural commodity, legalizing hemp federally, which made it easier for farmers to get production licenses, get loans to grow hemp, and allowed them to get federal crop insurance. Some states still consider it illegal to grow hemp, but 41 states have begun the process to make hemp legal to grow at the state level, as of 2019.
Marijuana looks contrastingly different from hemp. When you observe their leaves, marijuana’s shape tends to either be broad leafed, a tight bud, or look like a nugget with organd hairs. Hemp, on the other hand, has skinnier leaves that’s concentrated at the top. Few branches or leaves exist below the top part of the plant. When you observe the plants from afar, marijuana looks like a short fat bush. Hemp is typically skinnier and taller (up to 20 ft). At times, it almost looks like long ditchweed – hemp was actually found to grow among weeds in Nebraska. In general, when you compare a marijuana farm with those of industrial hemp, you’ll notice that they are clearly very different from one another.
Hemp can be used as a "mop crop" to clear impurities out of wastewater, such as sewage effluent, excessive phosphorus from chicken litter, or other unwanted substances or chemicals. Additionally, hemp is being used to clean contaminants at the Chernobyl nuclear disaster site, by way of a process which is known as phytoremediation—the process of clearing radioisotopes and a variety of other toxins from the soil, water, and air.