Mexico's most dangerous city for police refuses to give up or negotiate with cartels

Celaya, a city in Guanajuato state, Mexico, has become one of the most dangerous places to be a cop in North America. The city's police force, composed mainly of former federal police officers, has chosen to confront the Santa Rosa de Lima cartel, resulting in the deaths of many officers. As Mexico's June 2 presidential election approaches, this city lies at the crossroads of a national debate about security policy.