On 20 May 2004, agents of the state INCA task force, county narcotics officers and Chino and Ontario police seized about 1,100 pounds (about 499 kg) of marijuana in the city of Ontario.[1][2] Acting on a tip about drug activity at a condominium in the 2000 block of Magnolia Avenue, officers watched Arnulfo Contreras Mendoza, 42, leave the complex and stopped his pickup in Chino, finding about 100 pounds of packaged marijuana in the truck bed before arresting him.[1][2] He was booked into West Valley Detention Center on suspicion of transporting and selling marijuana and later released after posting $50,000 bail.[2]

That night officers searched the condominium and found about 1,000 more pounds in a locked bedroom, along with a kilo press and some 30 large bundles of smaller bricks.[1][2] The marijuana, suspected to be Mexican-grown and possibly handled by a paid “mule,” carried an estimated street value of about $5 million.[1][2]