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Forensics personnel and investigators inspect the bullet-riddled windshield of a car followimng an attack by gunmen that killed two policemen on a street in Culiacan, Sinaloa state, July 12, 2011. Mexico has been gripped by drug-related violence that has killed some 37,000 people since 2006, when the government launched a military crackdown on the cartels. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)
Forensics personnel and investigators inspect the bullet-riddled windshield of a car followimng an attack by gunmen that killed two policemen on a street in Culiacan, Sinaloa state, July 12, 2011. Mexico has been gripped by drug-related violence that has killed some 37,000 people since 2006, when the government launched a military crackdown on the cartels. AFP PHOTO / Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)

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    Mexican drug violence a global problem

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Mexican drug violence a global problem

Becky Anderson speaks to Ana Maria Salazar about the challenges faced by the Mexican government in fighting cartels.

Mexican drug violence a global problem

Becky Anderson speaks to Ana Maria Salazar about the challenges faced by the Mexican government in fighting cartels.