A Canadian nurse who said she was on her way to help with the coronavirus response at a Detroit hospital was stopped at the U.S. border with more than 150 pounds of marijuana, The Detroit News reported Thursday.

Terri Lynn Maxwell, 48, told U.S. Customs and Border Protection (CBP) authorities she was headed to Henry Ford Hospital to help treat coronavirus patients. The Ontario resident was carrying a Canadian passport and work permit showing she is a first responder, which allows her to cross the border into the U.S.

Upon examination, CBP agents found 153 pounds of marijuana in the trunk of her vehicle. The offense carries a penalty of 20 years in prison.

“At a time when health care professionals are working overtime to keep us safe, it’s really shameful that anyone would exploit their status as a nurse to smuggle any kind of drug into our country,” U.S. Attorney Matthew Schneider said in a court filing, according to The Detroit News. “To stop the spread of the coronavirus, our Canadian border is open only for essential travel — and smuggling in marijuana simply isn’t essential.”

Canadian Prime Minister Justin Trudeau announced Saturday that U.S.-Canada border restrictions will be extended for another 30 days as both countries continue to grapple with the coronavirus pandemic.