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Part of the White House argument for building a wall on the U.S.-Mexico border with Mexico has been that a barrier will impede the flow of drugs into the United States, but that argument does not sit well with the Drug Enforcement Administration, which is concerned smugglers will likely find ways of avoiding a wall altogether, like flying over it with unmanned aircraft. “Our southern border is a pipeline for vast quantities of illegal drugs, including meth, heroin, cocaine, and…
