The parents of a boy suffering from severe seizures have filed a lawsuit against the state of Arizona to ensure that their son will have access to medicinal cannabis oil without the risk of prosecution.

Zander Welton, 5, was born with cortical dysplasia, a genetic defect that disrupts cellular patterns in the brain and is often the cause of epilepsy. Zander is non-verbal and suffered seizures daily before his parents started giving him cannabis oil.