On Location video: Mexico's oil bandits

The structures used to precess oil at Mexican state-owned petroleum company PEMEX refinery in Tula, Hidalgo state, Mexico. (OMAR TORRES/AFP/Getty Images)</p>

The structures used to precess oil at Mexican state-owned petroleum company PEMEX refinery in Tula, Hidalgo state, Mexico. (OMAR TORRES/AFP/Getty Images)

Mexican drug cartels are suspected of running large oil-stealing operations.