One bus driver took going green to a whole new level this week, filling his gas tank with a thousand pounds of pot.

Customs and Border Protection officers near San Diego discovered the stash hidden inside a commercial bus in line to cross at the San Ysidro port of entry.

A 56-year-old Mexican citizen was waiting with the bus, according to border officials. An officer sensed something was off, and a detection dog confirmed the suspicion. An imaging system revealed oddities with the bus's gas tank.

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CBP officers searched the bus and found 110 packages of marijuana inside the tank, according to officials. They weighed 1,071 pounds and have an estimated street value of $482,000.

Officers took the driver into custody.