Police in Mexico find a cannon attached to a compressor on an abandoned pickup truck . The 33 cans contained a total of 85 pounds of marijuana , valued at $ 42,500 , U.S. authorities said . Hide Caption In a separate incident last year , U.S. agents found cans of marijuana plopped in an Arizona field . Cannon is believed to have been involved in that incident , too , U.S. agent says .
Police in Mexico find a cannon attached to a compressor on an abandoned pickup truck . Hide Caption In a separate incident last year , U.S. agents found cans of marijuana plopped in an Arizona field . Cannon is believed to have been involved in that incident , too , U.S. agent says .