U.S. Customs and Border Protection officers discovered 156 pounds of marijuana packed within a shipment of frozen vegetables.

CBP says a 62-year-old Canadian man arrived at the Fort Street cargo facility in Detroit on Friday, with a shipment of frozen vegetables destined for Chicago.

The shipment underwent an X-ray scan, but came back inconclusive. Officers conducted a visual examination of the 29 pallets and discovered 134 packages of marijuana mixed within the shipment of vegetables.

Police estimate the value of the drugs to be $626,000.

“This is a very significant marijuana seizure. Extreme lengths were used in an attempt to conceal this shipment,” says John Nowak, Acting CBP Detroit Port Director. “I commend the CBP officers involved in making this seizure and stopping this shipment of drugs from reaching our streets.”

CBP says the driver was arrested and turned over to U.S. Immigration and Customs Enforcement special agents.

He hwas since been released back to Canada and will reportedly avoid charges with officials indicating they had no information indicating he was aware of what was in the cargo.

The commercial truck and marijuana were seized.