AdvertisementOn The Trail Of Mexico's Vicious Sinaloa CartelMay 18, 2010John BurnettRenee MontagnefacebookEmailThe Santa Fe bridge (shown in February 2010) links the Mexican city of Ciudad Juarez (bottom) with the U.S. city of El Paso in Texas. American law enforcement officials say they are worried that violence from newly Sinaloa-controlled areas of Ciudad Juarez will spill over into the U.S. (AP)