More than 1,000 people have been killed in Mexico in drug-related violence this year. 6,000 people died last year. Much of the violence has been fueled by the ability of drug cartels to purchase AK-47s assault rifles and other arms in the United States. According to law enforcement officials, 90 percent of the guns picked up in Mexico from criminal activity are purchased in the United States. In Phoenix, Arizona, a gun store owner goes on trial today on charges that he sold more than 700 weapons to straw buyers, knowing that the firearms were bought on behalf of Mexican drug syndicates.