After London officials seized a six-month supply of cannabis oil used to treat a 12-year-old’s seizures, the child’s mother has said that Home Office minister Nick Hurd has “likely signed my son’s death warrant,” The Telegraph reports. Charlotte Caldwell and her son, Billy, were returning from Toronto when the oil they had purchased was confiscated by border officials. The Telegraph reports that Billy, who was the first person in the U.K. to receive a prescription for medical marijuana, can have up to 100 seizures a day, and would miss his first treatment in 19 months if officials do not return the oil. His physician, Brendan O’Hare, was recently told by the Home Office to stop writing the prescriptions. “It's Billy's anti-epileptic medication that Nick Hurd has taken away,” Caldwell said at a press conference. “It's not some sort of joint full of recreational cannabis.” Caldwell is meeting with Hurd today to discuss the matter, but noted that regardless of the meeting’s outcome, she would ensure her son received his treatment. “I will just go back to Canada and get more and I will bring it back again because my son has a right to have his anti-epileptic medication in his country, in his own home,” she added, according to The Telegraph.