FILE - Caretakers oversee a grow room for medical marijuana at ShowGrow, a medical marijuana dispensary in Los Angeles, April 20, 2017. (AP Photo/Richard Vogel, File)

FILE - A marijuana plant is visible at a medical marijuana dispensary in Egg Harbor Township, N.J., March 22, 2019. (AP Photo/Julio Cortez, File)

FILE - A cashier rings up a marijuana sale, July 1, 2017, at a cannabis dispensary in Las Vegas. (AP Photo/John Locher, File)