In Mexico, the "war on drugs" isn't just an expression people use. Half an hour drive from San Diego in frontier towns like Tijuana, it's a war zone.
Authorities are fighting a bloody battle against the drug lords. Since the beginning of the year, more than 1,500 people have been killed, a third of them members of the military and police officers.
"This is a war, and in a war, you have tragedies," Tijuana Police Chief Alberto Capella said. "And we are not finished paying the costs."