The key difference between hemp and marijuana is that hemp contains practically zero THC. In fact, in order to be classified as hemp, a cannabis plant must contain less than 0.3% THC by volume. This is really important because it’s actually the reason why hemp products are legal to buy, sell, and ship. If they don’t get you high, then why would they be illegal?
Officially, marijuana is deemed as Schedule I herbal substance by the U.S. Drug Enforcement Administration, meaning the drug offers "no currently accepted medical use and a high potential for abuse," according to the federal government. That categorization was adjusted after the passage of the 2018 Farm Bill, which included a provision that separated hemp from marijuana, as noted in the Controlled Subject Act.
Instead, the human body manages cannabinoids through its endocannabinoid system, also known as ECS, which can process CBD and hemp oil through the body and is managed by the human brain, which uses cannabinoids to regulate the body's physiological reactions to the herb, and help better manage key human elements like eating, sleeping, dealing with pains and illnesses, and improving mood.
Yes: CBD extracts can’t always be trusted. A 2017 JAMA paper reported that almost 70 percent of all CBD products sold online do not contain the amount of CBD stated on the label. Of the 84 products bought from 31 different companies, 42 percent contained a higher concentration of CBD oil than the label claimed, and 26 percent of the products contained less than the label claimed. The remainder of products contained the labeled amount—give or take 10 percent.
Zuardi, A. W., Crippa, J. A., Hallak, J. E., Bhattacharyya, S., Atakan, Z., Martin-Santos, R., … & Guimarães, F. S. (2012). A critical review of the antipsychotic effects of cannabidiol: 30 years of a translational investigation [Abstract]. Current Pharmaceutical Design, 18(32), 5,131–5,140. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/22716160