been killed. the violence shows no signs of slowing. last year there were under 10,000 cartel-related murders. this year is shaping up to be worse. mexican president calderon sent thousands of troops and federal police to the border. hundreds of them have been slaughtered, even more have quit. gun battles rage nearly everyday. while the cartels began murdering and kidnapping each other they soon found profit in targeting civilians and legitimate businessmen. >> i'm a mexican businessman. i was kidnapped in teenage teenage they threatened if my -- in tijuana. they threatened if my family did not pay they would cut off my ears or fingers. >> sean: dea stationed in mexico. >> these people are unpredictable, very bloodthirsty.