The illegal drug market in the United States is one of the most profitable in the world. Drug law enforcement agencies face an enormous challenge in protecting the country's borders. Each year, according to the U.S. Customs Service (USCS), 60 million people enter the United States on more than 675,000 commercial and private flights. Another 6 million come by sea and 370 million by land. In addition, 116 million vehicles cross the land borders with Canada and Mexico. More …
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