On May 26, 2022, the U.S. Food and Drug Administration (FDA) issued Warning Letters to four companies[1] concerning the illegal sale of unapproved animal drugs containing cannabidiol (CBD) intended for use in food-producing animals. These Warning Letters demonstrate the first time the FDA chose to focus on marketing CBD-containing products for use in food-producing animals, as opposed to pets, and the specific concerns related to such use. Food-producing animals, as defined by the FDA, include cattle (veal calves, beef cattle, and dairy cattle), swine, chickens, turkeys, and others (such as lambs).