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As the Department of Homeland Security's surveillance intensifies along the Rio Grande River, powerful drug cartels and human smugglers are trying more desperate tactics. Agents hiding on the banks of the river spot drug mules on rafts and confiscate more than $650,000 in marijuana. Officers find a drug cache worth millions hidden in an SUV. An elite team of Brownsville PD plainclothes, uniformed and K-9 officers raid a downtown property, uncovering a cache of marijuana ready for distribution.