Mexican Cartel Radio Network

I have encountered news reports in the past that suggested some of the Mexican drug cartels were utilizing a wide-area, encrypted radio system to outsmart both the Mexican and US authorities. It appears that the Mexican military was able to take down this network:

http://www.borderlandbeat.com/2011/09/marines-dismantle-los-zeta.html

http://gizmodo.com/5840412/mexican-commandos-just-took-down-this-secret-drug-cartel-radio-grid