By Sara Miller Llana
The Christian Science Monitor
MEXICO CITY, Mexico — Angel Augusto Nunez, a police cadet, knows that cops have a bad rap in Mexico.
And as fresh violence has swept the nation's police force into the center of the drug war - with the unprecedented slaying of at least four high-ranking officers this month - new questions about how many officers are colluding with drug dealers and how effective police efforts are have battered its reputation once more.
Mexico boosts police ethics to fight drugs