The latest drug bust on Interstate-80 involved a vehicle that was a bit bigger than a standard passenger car.About 400-thousand dollars worth of marijuana was taken off the street yesterday in Dallas County. D-O-T authorities got suspicious of a semi tractor that pulled into a weigh station without a trailer, and lacking required markings on the cab door. They inspected, and found 320-pounds of marijuana and two pounds of cocaine. Two men in the rig were charged with possession to distribute marijuana and cocaine. One’s also being investigated by the Immigration and Naturalization Service.