Illinois State Police have arrested an Arizona man after finding more than 2,000 pounds of marijuana hidden in the back of a tractor trailer he drove on Interstate 55.

State Police Lt. Fred Winterroth says the 50-year-old driver is from Tucson, Ariz., and is being questioned. He hasn't been formally charged.

Winterroth says a trooper pulled over the semi on I-55 just north of Bloomington at about 12:30 a.m. Monday to do a safety inspection.

The trooper found 100 bundles of marijuana hidden in a load of paper products in the truck's trailer.

A passenger riding in the truck's cab was released.