OTAY MESA, Calif. (WLNS) — Border officers uncovered 614 pounds of methamphetamine hidden in a shipment of green onions on Sunday.

U.S. Customs and Border Protection officers encountered a 31-year-old man driving a tractor pulling a trailer with a shipment manifested as “mint leaves and other spices.”

The shipment raised questions during an X-ray exam and was sent to be screened by a canine team.

A detector dog alerted officers who found 40 wrapped packages along with the green onions. The substance field-tested positive for the properties of methamphetamine, according to a CBP news release.

The driver was turned over to Homeland Security Investigations.

Officers seized the tractor, trailer, and narcotics. The seized methamphetamine has an estimated street value of $1.4 million, according to officials.