Investigation reveals gun buys tied to cartel

Published On: May 16 2012 10:34:01 PM CDT   Updated On: May 16 2012 11:31:31 PM CDT

May 16, 2012: New details are surfacing in a sweeping federal investigation involving gun buys from Beaumont to Pasadena, the Zetas Drug Cartel and the death of a federal agent on Mexican soil. Robert Arnold reports.