Illicit Drug Flows and Seizures in the United States: What Do We [Not] Know?

Summary

Policy discussions around issues such as border security, drug trafficking, and the opioid epidemic include questions about illicit drug flows into the United States. While there are numerous data points involved in understanding the trafficking of illicit drugs into the United States, these data are often estimated, incomplete, imperfect, or lack nuance. For example, debates about drug flows and how best to counter drug trafficking into the country often rely on selected drug seizure data from border officials, which do not reflect all drug flows into the United States.

One way of conceptualizing the flow of illicit drugs—both plant-based and synthetic—into the United States is as a funnel. At the top of this funnel is the universe of illicit drugs produced around the world, both foreign and domestic. Factors affecting actual illicit cultivation and/or production are numerous and diverse, as are those affecting analysts’ and officials’ abilities to measure total worldwide production. Of all the illicit drugs that are produced around the world, some portion is destined for the United States. Of the total amount of illicit drugs that reach the U.S. border by land, air, or sea, some portion is known because it was seized by border officials, and an unknown portion is successfully smuggled into the country. While the proportion of illicit drugs coming into the country that are seized is unknowable, the amount of drugs seized is. And, data on drug seizures at the U.S. borders have sometimes served as a reference for policy debates on border security and drug trafficking into the country, in part because it is a knowable portion of drug trafficking problem.

The primary agency charged with safeguarding the U.S. borders (including seizing illicit drugs and other contraband) is the U.S. Customs and Border Protection (CBP). Within CBP, the Office of Field Operations (OFO) is responsible for managing ports of entry and seizes drugs being smuggled into the United States at ports of entry; the Border Patrol is responsible for securing the border between ports of entry and seizes drugs being smuggled into the country between ports of entry. CBP data from OFO and Border Patrol indicate that for cocaine, methamphetamine, heroin, and fentanyl, larger quantities by weight are seized at legal ports of entry than are seized between the ports. Conversely, a larger quantity by weight of illicit marijuana is seized between the ports of entry.

CRS analysis of OFO drug seizure data from FY2014 to FY2018 indicate that across those five years, about 65% of seized illicit drugs, by weight, were seized at land ports of entry at the border, about 28% of seized drugs were seized at air ports of entry, and about 5% were seized at sea ports of entry. CRS analysis of these data also indicate that nearly 97% of drugs were seized during inbound inspections across those years. CBP is not the only agency that seizes illicit drugs in the United States or even in the border regions. Federal, state, local, and tribal law enforcement agencies are all involved in enforcement actions that—even if not focused on drug-related crimes—may involve drug seizures. Notably, though, there is no central database housing information on illicit drug seizures from all law enforcement agencies, federal or otherwise.

Even though the quantity of total illicit drugs produced around the world that is destined for the United States—and successfully smuggled into the country—is unknown, the likely source of the drugs seized may, in some instances, be knowable. U.S. officials chemically analyze a portion of illicit drugs seized to identify the source and, in conjunction with drug intelligence, assess which countries may be the major suppliers of certain illicit drug types found in the country.

In the absence of precise data on illicit drugs moving toward and into the United States, seizure data can provide insight into various elements of drug flows such as smuggling points into the United States and target markets within the country. If policymakers are interested in having a more robust view of drug seizures throughout the country, they could move, through mandates or incentives, to enhance data collection and consolidation of drug seizure data by law enforcement officials. Policymakers may also question how border officials use intelligence about drug flows and data on drug seizures to assess the risks posed by drug trafficking and appropriately allocate resources to counter the threat. They may also evaluate how well available data on drug seizures can help measure progress toward achieving goals outlined in national strategies aimed, at least in part, at reducing drug trafficking into and within the country.