05/31/2014 08:05 pm ET Updated May 31, 2014

An Oil-rich Area South Of Texas Is Mexico's Newest Drug-war Crisis Zone

With unfailing punctuality, the grocer receives text messages from his extortionist on the last day of each month. The medical students leave their lab coats at school, to avoid roaming gangsters who need surgery. The oil man mutters on his two-way radio as he drives behind tinted glass.

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