Marijuana is different from cannabidiol (CBD). Marijuana refers to the dried flowers, leaves, stems, and seeds of the cannabis plant. CBD is one of the many compounds, along with THC (tetrahydrocannabinol), that can be present in the cannabis plant. CBD does not cause a “high” by itself. CBD can be derived from hemp, which is defined as any part of a cannabis sativa plant with no more than 0.3% of THC, or non-hemp plants.
In 2018, the U.S. Congress passed and signed into law the Agriculture Improvement Act. This law removed hemp from the federal Controlled Substances Act, effectively legalizing CBD if it comes from hemp.
However, a few states have not removed hemp from their state’s controlled substances acts, so legality of CBD products differs across states.
Agriculture Improvement Act of 2018. H.R.2, 115th Cong. 2017-2018. https://www.congress.gov/bill/115th-congress/house-bill/2.