A mother from Watton, who illegally treated her terminally-ill son with cannabis, is lobbying MPs at the Houses of Parliament today.
Callie Blackwell gave her 14-year-old son Deryn cannabis oil to ease his pain, after he'd undergone four years of treatment for two separate cancers, and he made a remarkable recovery.
She says there are many other people who've been in their shoes: "When pharmaceutical drugs were killing him, cannabis didn't.
"You'll see today outside Parliament, there'll be thousands of people there who all use cannabis as their only medicine because pharmaceutical industries have let them down."
Newport West Labour MP Paul Flynn is introducing a 10-minute rule bill calling for medicinal use of cannabis to be legalised, and patients and families are lobbying as well.