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Mexican TCOs transport the bulk of their drugs over the Southwest Border through ports of entry (POEs) using passenger vehicles or tractor trailers. The drugs are typically secreted in hidden compartments when transported in passenger vehicles or comingled with legitimate goods when transported in tractor trailers. Once across the Southwest Border, the drugs are transported to stash houses in hub cities such as Dallas, Houston, Los Angeles, and Phoenix, and then transported via these same conveyances to distribution groups in the Midwest and on the East Coast.

…The Sinaloa Cartel employs drivers who are older US citizens to drive tractor trailers because they believe they draw less attention from law enforcement than younger drivers in passenger vehicles.

In Arizona, transportation and smuggling activities also occur between the POEs in remote, inhospitable desert valleys separated by rugged mountainous terrain. One such location is the West Desert corridor, which is a sparsely populated area ideal for smuggling, as transportation groups use off-road vehicles, backpackers, and all terrain vehicles to move large amounts of marijuana for transport to the Phoenix and Tucson metropolitan areas for further distribution. These transportation groups use lookouts and scouts on elevated locations to direct their cross-border smuggling activities with advanced radio communications to avoid law enforcement detection and apprehension.
2015 National Drug Threat Assessment Summary (Washington: U.S. Drug Enforcement Administration, November 4, 2015): 3 <http://www.dea.gov/divisions/hq/2015/hq110415.shtml>.