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              Congressional
            *aResearch Service






Drug Trafficking at the Southwest Border:

Homeland Security Issues in the 116th

Congress



Updated January 31, 2019

The United States sustains a multi-billion dollar illegal drug market. An estimated 28.6 million
Americans, or 10.6% of the population age 12 or older, had used illicit drugs at least once in the past
month in 2016. The 2018 National Drug Threat Assessment indicates that Mexican transnational criminal
organizations (TCOs) continue to dominate the U.S. drug market. They remain the greatest criminal drug
threat to the United States; no other group is currently positioned to challenge them. The Drug
Enforcement Administration (DEA) indicates that these TCOs maintain and expand their influence by
controlling lucrative smuggling corridors along the Southwest border and by engaging in business
alliances with other criminal networks, transnational gangs, and U.S.-based gangs.
TCOs  either transport or produce and transport illicit drugs north across the U.S.-Mexico border.
Traffickers move drugs through ports of entry, concealing them in passenger vehicles or comingling them
with licit goods on tractor trailers. Traffickers also rely on cross-border subterranean tunnels and ultralight
aircraft to smuggle drugs, as well as other transit methods such as cargo trains, passenger busses,
maritime vessels, or backpackers/mules. While drugs are the primary goods trafficked by TCOs, they
also generate income from other illegal activities such as the smuggling of humans and weapons,
counterfeiting and piracy, kidnapping for ransom, and extortion.
After being smuggled across the border, the drugs are distributed and sold within the United States. The
illicit proceeds may then be laundered or smuggled as bulk cash back across the border. While the amount
of bulk cash seized has declined over the past decade, it remains a preferred method of moving illicit
proceeds-along with money or value transfer systems and trade-based money laundering. More recently,
traffickers have relied on virtual currencies like Bitcoin to move money more securely.
To facilitate the distribution and local sale of drugs in the United States, Mexican drug traffickers have
sometimes formed relationships with U.S. gangs. Trafficking and distribution of illicit drugs is a primary
source of revenue for these U.S.-based gangs and is among the most common of their criminal activities.
Gangs may work with a variety of drug trafficking organizations, and are often involved in selling
multiple types of drugs.

                                                                Congressional Research Service
                                                                  https://crsreports.congress.gov
                                                                                      IN11030

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