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Federal agents and state troopers crack down on cartels smuggling drugs across southern border

Officials along the southern border say Mexican drug cartels are moving much larger shipments of drugs into the U.S. The amount of fentanyl jumped 800% in just one year. Janet Shamlian got an exclusive look at one area where agents and state troopers say it's harder to track drug smugglers because more migrants are also crossing the border.
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