FILE - In this Oct. 29, 2015 file photo, Graciela Elizalde, an 8-year-old who suffers from Lennox-Gastaut syndrome, a severe form of epilepsy that causes intense seizures, receives hydrotherapy treatment in Monterrey, Mexico. Elizalde's parents saw a difference in their daughter since she began taking a marijuana extract, after a federal judge gave them permission to import the marijuana oil. On Friday, April 28, 2017, Mexico’s lower house passed a bill approving the use of marijuana for medicinal purposes, and will go to President Enrique Pena Nieto to be signed into law. (AP Photo/Esteban Felix, File)