Margarete Santos de Brito with the cannabis oil they treat their daughter with. The oil does not contain THC, the he principal psychoactive constituent of cannabis. Margarete and her husband, Marcos Lins Langenbach, were the first people in Brazil to be given authorisation to grow marijuana at home for medicinal purposes. Their daughter, Sofia, has CDKL5, a rare genetic disorder and she's unable to stand on her own, walk, or talk. Marijuana evidently has been shown to provide some relief to people with her condition. Margarete had to argue her case in court and is now actively fighting for medical marijuana to be legalised nationally.
The cannabis-based medicine reduces the number of seizures Sofia has on a daily basis. There's no empirical proof because most research centres don't yet have government permission to run tests with medicinal cannabis. Patients react differently to it, but Margarete and other mothers of CDKL5 children say it has a significant effect in reducing seizures.