How Border Agents Fight Fentanyl Smuggling

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The United States is in the grip of one of the most severe public health and national security crises in its history, driven by the proliferation of illicit fentanyl.

On the front lines of this fight are the men and women of the U.S. Department of Homeland Security (DHS), primarily through its component agency U.S. Customs and Border Protection (CBP).

Working in close concert with partners like Homeland Security Investigations (HSI) and the Drug Enforcement Administration (DEA), these agencies are tasked with stemming the tide of this deadly substance.

The Global Fentanyl Pipeline

The fight against fentanyl begins thousands of miles from the U.S. border, spanning continents and involving a complex, adaptive network of chemical manufacturers and criminal organizations. The pipeline is not a simple, linear path but a dynamic system that has evolved in response to international law enforcement pressure.

China: The Chemical Source

For years, the People’s Republic of China (PRC) was the primary source of not only finished fentanyl but also the precursor chemicals required for its synthesis. Following intense diplomatic engagement with the United States, the Chinese government took a significant step in 2019 by placing all fentanyl-related substances under a controlled regulatory schedule. This action dramatically curtailed the direct flow of finished fentanyl from China to the U.S.

However, this did not stop the flow of materials. Instead, Chinese chemical companies and traffickers pivoted their business model. They shifted from producing the final product to mass-producing and exporting the essential precursor chemicals—the building blocks of fentanyl.

A critical challenge for international law enforcement is that many of these precursors have legitimate industrial uses and are not subject to the same stringent international controls as fentanyl itself, allowing them to be produced and exported legally from China. Chinese firms often advertise these chemicals openly online and employ deceptive shipping practices to evade detection, such as mislabeling shipments as furniture parts or makeup and using re-shippers to obscure the country of origin.

Renewed U.S.-China counternarcotics cooperation, including a working group established following a November 2023 summit between President Biden and President Xi, has led to some progress. The PRC has taken law enforcement action against certain chemical companies, shutting them down and arresting key individuals indicted in the U.S.

Mexico: The Manufacturing Hub

As the direct supply of finished fentanyl from China waned, Mexico emerged as the central hub for its mass production and trafficking into the United States. Two powerful Transnational Criminal Organizations (TCOs)—the Sinaloa Cartel and the Cártel de Jalisco Nueva Generación (CJNG)—dominate this illicit industry. These cartels leverage their sophisticated, pre-existing drug trafficking infrastructure to import precursor chemicals from China and other parts of Asia.

Within clandestine laboratories in Mexico, these precursors are synthesized into finished fentanyl. The cartels then use industrial-grade pill presses, often also imported from China, to manufacture wholesale quantities of counterfeit pills. These pills are painstakingly designed to mimic legitimate prescription medications like oxycodone (often marked “M-30”), Percocet, or Xanax, a deceptive tactic that contributes to a high number of unintentional poisonings in the U.S.

Once manufactured, the cartels control the trafficking corridors through Mexico and across the U.S. border, where the drugs enter the American market.

India: The Emerging Player

The evolution of the fentanyl supply chain demonstrates the “balloon effect” common in counternarcotics: when pressure is applied to one part of the network, the illicit activity bulges out elsewhere. As international scrutiny and regulations on Chinese chemical exports have increased, TCOs have begun to diversify their sourcing. India is rapidly emerging as a significant new node in the global fentanyl network, supplying both finished fentanyl powder and, more critically, precursor chemicals.

DEA reporting indicates that some trafficking organizations have shifted production from China to India to circumvent China’s stricter controls and the increasing pressure from Chinese authorities. A 2018 seizure in Mumbai of approximately 100 kilograms of a fentanyl precursor, deliberately mislabeled and destined for Mexico, provided concrete evidence of the growing links between Mexican TCOs and India-based chemical suppliers.

This diversification makes the supply chain more resilient and complex, posing a greater challenge to U.S. and international law enforcement efforts. It signifies that the fentanyl problem is not rooted in a single nation but is a globalized, decentralized network that can rapidly adapt its sourcing to the path of least resistance.

Where Fentanyl Really Crosses the Border

A prevalent narrative in public and political discourse suggests that illicit fentanyl is primarily carried into the United States by migrants crossing the border illegally between official checkpoints. However, data from the U.S. government’s own law enforcement agencies paints a starkly different and consistent picture. The overwhelming majority of fentanyl is smuggled through official Ports of Entry (POEs), and the primary smugglers are not migrants, but U.S. citizens.

The Data on Where Seizures Happen

The data is unequivocal: the main arteries for fentanyl trafficking are the nation’s legal border crossings. More than 90% of all fentanyl interdicted by CBP is seized at official POEs or at interior vehicle checkpoints located on highways leading away from the border. This pattern has held steady for years.

An analysis of CBP data from Fiscal Year (FY) 2018 through FY 2024 revealed that over 92% of all fentanyl was seized at a POE or a Border Patrol vehicle checkpoint.

In the first half of 2025, 84% of all confiscated fentanyl was intercepted at official entry points. Specifically, 80% of the total was seized at Southwest Border POEs, with another 14% seized by Border Patrol along the Southwest border—a figure that includes seizures from vehicle stops on roads, not just from individuals on foot.

An analysis of nearly 700 CBP press releases from 2021 to 2024 found that 519 smuggling incidents occurred at POEs, while only 10 occurred between ports of entry involving migrants on foot.

The reason for this is a matter of simple logistics for the cartels. TCOs exploit the immense volume of legitimate cross-border traffic. On an average day in March 2025, over 204,000 personal vehicles and nearly 21,400 trucks crossed the southern border into the U.S. It is operationally impossible for CBP to conduct intensive, physical searches on every vehicle without bringing legal trade and travel to a standstill.

This high volume and the low probability of any single vehicle being selected for a detailed inspection create the ideal environment for smuggling.

Who Actually Smuggles Fentanyl

Counter to the prevailing narrative, the data clearly shows that U.S. citizens are the demographic most frequently recruited and arrested for trafficking fentanyl across the border.

Conviction Data: According to the U.S. Sentencing Commission, 86.2% of all offenders convicted of federal fentanyl trafficking in FY 2021 were U.S. citizens. A separate analysis of convictions in southwest border districts from 2018 to 2023 found that U.S. citizens accounted for 80% of the total.

Apprehension Data: An analysis of CBP data from October 2018 to June 2024 confirmed that approximately four out of five individuals apprehended for smuggling fentanyl at the southern border were U.S. citizens.

The criminal logic behind this is straightforward: TCOs recruit U.S. citizens because they are guaranteed entry into the United States and are generally subject to a lower level of scrutiny at POEs compared to foreign nationals. Smugglers are often ordinary people, sometimes vulnerable individuals recruited for payments ranging from $1,000 to $10,000 for a single trip.

How Traffickers Hide the Drugs

Traffickers use a wide variety of concealment methods to move fentanyl through POEs. The most common method involves hiding the drug in passenger vehicles, followed by smuggling by pedestrians and concealment within commercial cargo. The techniques are often sophisticated and designed to evade detection.

CBP officers routinely find fentanyl hidden in purpose-built aftermarket compartments in vehicle floorboards, gas tanks, spare tires, and engine manifolds. For example, a single traffic stop in Campo, California, resulted in the arrest of a U.S. citizen transporting 250 pounds of fentanyl concealed in a spare tire and the vehicle’s gas tank.

In commercial cargo, fentanyl has been found commingled with legitimate goods, such as a shipment of green beans. Pedestrians have been caught with smaller amounts concealed on or inside their bodies.

Major Operations Fighting Fentanyl

In response to the evolving threat, DHS and its partner agencies have shifted from a purely defensive posture to a more proactive, intelligence-driven strategy. This modern approach aims to attack the entire illicit supply chain—from the foreign chemical suppliers to the domestic distributors—rather than simply waiting to seize drugs at the border.

Operation Apollo

Launched in Southern California and later expanded to Arizona and Texas, Operation Apollo is a cornerstone of CBP’s national counter-fentanyl strategy. It functions as an intelligence-gathering and partnership-driven initiative, aiming to disrupt drug and chemical supply lines by leveraging collaboration with federal, state, and local law enforcement. The goal is to build a comprehensive understanding of TCO logistics, routes, and techniques to better dismantle their networks.

Operation Blue Lotus & Operation Four Horsemen

This was a powerful two-pronged surge effort. Operation Blue Lotus concentrated CBP and HSI resources at Southwest Border POEs, working with state and local partners to expose trafficking networks. In its final week alone, Blue Lotus saw a 2000% increase in seizures at a single POE and resulted in 284 arrests.

Complementing this was Operation Four Horsemen, a U.S. Border Patrol (USBP) initiative focused on interdicting fentanyl between POEs and at nearby highway checkpoints. Together, these operations seized nearly 10,000 pounds of fentanyl and a similar amount of other narcotics.

Operation Artemis

This joint CBP and HSI operation specifically targeted the means of production. By deploying multi-disciplinary “jump teams” to strategic locations, Operation Artemis focused on interdicting precursor chemicals, pill presses, and die molds. In just four months, it led to over 900 seizures, including more than 13,000 pounds of fentanyl precursor chemicals, disrupting the supply chain before the final deadly product could be manufactured.

Operation Plaza Spike

This operation represents the most targeted and offensive phase of the strategy. Led by CBP, Operation Plaza Spike aims to dismantle the command-and-control structure of the cartels by specifically targeting the “plaza bosses”—the key logistical managers who facilitate the flow of fentanyl and precursors through specific territories or “plazas” along the border. This effort signals a direct move to decapitate the leadership of trafficking networks.

Operation Rolling Wave

This operation surged inbound inspection resources at Southwest Border checkpoints, utilizing predictive analysis and enhanced intelligence sharing to target high-risk vehicles traveling on interior highways away from the immediate border.

The composition of these operations reveals a clear strategic progression. While efforts like Blue Lotus and Rolling Wave represent an enhanced version of a traditional defensive strategy—fortifying the border to seize incoming drugs—the broader portfolio shows a decisive shift toward offense. Operation Artemis attacks the means of production, aiming to disrupt the supply chain before fentanyl is even created. Operation Apollo focuses on intelligence to map and understand the entire criminal ecosystem. Most aggressively, Operation Plaza Spike targets the human leadership of the cartels.

Technology: Promise and Problems

Technology is a critical force multiplier in CBP’s fight against fentanyl, enabling officers to screen a larger volume of traffic and detect concealed contraband. However, the promise of advanced technology is often tempered by the harsh realities of implementation, maintenance, and the inherent scientific challenges of detecting a substance as potent and adaptable as fentanyl.

X-Ray and Scanning Systems

Non-Intrusive Inspection (NII) systems are the technological backbone of CBP’s interdiction efforts at POEs. These large-scale X-ray and gamma-ray imaging systems allow officers to scan entire passenger vehicles, trucks, and cargo containers for anomalies—such as hidden compartments or unusual densities—without conducting a time-consuming physical search.

DHS has set ambitious goals to use this technology to increase the percentage of passenger vehicles scanned at the Southwest border from just 2% to 40%, and cargo vehicles from 17% to 70%.

The Reality of Implementation

Despite significant congressional funding, government watchdogs have uncovered major problems with the NII program, revealing a critical gap between acquisition and effective deployment. A June 2025 report from the DHS Office of Inspector General (OIG) found:

Deployment Failure: Of 150 new fixed NII systems purchased by CBP, only 50 (33%) had been fully installed and deployed. A staggering 43 systems, valued at over $96 million, were sitting in storage, some for over a thousand days.

Operational Failure: Even among the systems that were installed, performance was poor. The OIG found that 46% of the 361 installed large-scale NII systems were inoperable for extended periods between FY 2019 and 2023, sometimes for as long as 344 days, while awaiting repair.

Practical Hurdles: The OIG attributed these failures to poor program management, including a lack of comprehensive deployment planning before purchasing the systems. This led to unforeseen problems, such as the new scanners interfering with existing radiation detection equipment, insufficient funding for site preparation and installation, and physical space constraints at older POEs built on bridges or surrounded by private land.

Beyond logistical failures, NII technology faces fundamental scientific limitations. Fentanyl’s high potency means a lethal quantity can be very small and difficult for imaging systems to detect. Furthermore, another OIG report from 2019 found that the small-scale handheld chemical screening devices used by officers were often unable to identify fentanyl at low purity levels (10% or less), which is the form it is most commonly seized in at the Southwest border. When fentanyl is mixed with cutting agents, its chemical signature can be masked, making detection even more challenging for field equipment.

Drug-Detecting Dogs

CBP’s Canine Program is a vital and highly effective component of its detection strategy. With their superior sense of smell, K-9s can detect concealed narcotics that technology might miss. Their contributions are significant, with canine teams assisting in the seizure of nearly 13,000 pounds of fentanyl in FY 2022 alone. Numerous major drug busts have been initiated by a K-9 alerting on a vehicle or package.

Like the NII program, the Canine Program has faced scrutiny from government watchdogs over its management and data collection practices.

Unreliable Data: A 2022 Government Accountability Office (GAO) report concluded that data on canine-assisted drug seizures was unreliable. Despite policy requiring agents to document when a K-9 assists in a seizure, the GAO found wide and unexplained variations in how often this was recorded across different Border Patrol sectors, making it difficult to accurately assess the program’s effectiveness or allocate resources properly.

Training Deficiencies: A 2021 OIG report identified significant issues with the program’s training regimen. The report found that CBP was using outdated pseudo-narcotic and actual narcotic training aids, which could compromise a canine’s ability to effectively detect real-world substances.

Safety Risks: The extreme potency of fentanyl poses a constant and serious health risk to both the canines and their handlers. An accidental exposure during a search could be fatal. This risk initially caused some law enforcement agencies to hesitate in training dogs to detect fentanyl, though new safety protocols and training standards have since been developed to mitigate this danger.

Artificial Intelligence and Data Analytics

To augment its physical inspection capabilities, CBP increasingly relies on artificial intelligence (AI) and advanced data analytics. CBP’s National Targeting Center (NTC) uses sophisticated algorithms to analyze advance information on cargo, vehicles, and travelers, comparing it against law enforcement and intelligence databases to flag high-risk shipments for inspection.

Similarly, HSI’s RAVEN analytics platform uses AI and machine learning to help investigators map and dismantle fentanyl networks. DHS reports that in one year alone, these AI-driven machine learning models helped officers identify suspicious vehicles and passengers, leading to 240 seizures of various drugs, including fentanyl.

The consistent theme across these technological fronts is an implementation gap. The government has invested heavily in acquiring advanced tools, but systemic issues in program management, deployment logistics, maintenance, and performance measurement have prevented these tools from reaching their full potential.

Partnerships and Cooperation

The transnational and multifaceted nature of the fentanyl threat has made it clear that no single agency or country can combat it alone. In response, the U.S. government has fostered an unprecedented level of collaboration, breaking down traditional agency silos and building a networked response that mirrors the structure of the criminal organizations it is fighting.

Domestic Partnerships

The fight against fentanyl requires seamless cooperation among federal, state, and local law enforcement. At the federal level, the partnership between CBP, HSI, and the DEA is paramount.

CBP serves as the first line of defense, using its broad authorities at the border to interdict drugs at and between POEs.

HSI, as the primary investigative arm of DHS, takes the leads generated by CBP seizures and conducts complex, cross-border investigations into the TCOs responsible. HSI’s authority allows agents to follow the trail of drugs, money, and traffickers deep into the interior of the United States.

The DEA contributes its deep expertise in narcotics investigations, global intelligence networks, and its authority to lead drug enforcement operations nationwide.

This collaboration is formalized through various task forces. The Fentanyl Abatement and Suppression Team (FAST) in San Diego, for example, is a multi-agency task force led by HSI that brings together federal partners like CBP and DEA with the local District Attorney’s office to aggressively prosecute fentanyl distributors.

Another key initiative is the Border Enforcement Security Taskforce (BEST) program. Led by HSI, these task forces are located in strategic areas along the border and in the interior, co-locating personnel from multiple federal, state, local, and tribal agencies to share intelligence and coordinate operations against TCOs.

International Cooperation

Recognizing that the supply chain is global, U.S. strategy heavily emphasizes international partnerships.

Mexico: The U.S. and Mexico are working under the Bicentennial Framework for Security, Public Health, and Safe Communities, a bilateral agreement that prioritizes combating TCOs and fentanyl production. As part of this cooperation, the U.S. has provided Mexico with critical equipment and training, including forensics lab gear and over 800 U.S.-donated canines trained to detect fentanyl.

China: Despite geopolitical tensions, the U.S. maintains a Counternarcotics Working Group with the PRC. This diplomatic channel is focused on pressuring Beijing to enforce its laws against precursor chemical manufacturers and sharing intelligence to disrupt their operations.

Canada: The U.S., Mexico, and Canada collaborate through the Trilateral Fentanyl Committee to address the North American scope of the crisis, which includes evidence of Mexican cartels establishing synthesis labs in Canada.

Global Coalition: The United States has spearheaded the creation of a Global Coalition to Address Synthetic Drug Threats, which now includes over 140 countries working together to disrupt drug trafficking and illicit finance.

Scientific Collaboration

The fight is also being waged in the laboratory. The DEA, CBP, and the Food and Drug Administration (FDA) have formed a joint research consortium to develop a fentanyl attribution program. By performing in-depth chemical analysis of seized fentanyl samples, scientists aim to identify unique chemical signatures or “fingerprints.” This would allow law enforcement to trace different batches of fentanyl back to specific clandestine labs, synthetic routes, and trafficking networks, providing invaluable intelligence to dismantle the highest-level producers.

Fentanyl Seizures by the Numbers

To fully grasp the scale of the fentanyl crisis and the law enforcement response, it is essential to examine the data. The following tables synthesize information from U.S. government sources to provide a clear, quantitative picture of seizure trends, smuggling locations, and the individuals involved in trafficking.

Annual Fentanyl Seizures by CBP (Pounds)

This table illustrates the dramatic escalation in the amount of fentanyl being seized by CBP nationwide, reflecting both the increasing flow of the drug and enhanced enforcement efforts. Seizures grew exponentially from 2019, peaking in FY 2023, with recent data suggesting a possible leveling or decline.

Sources: Data synthesized from U.S. Customs and Border Protection reports and analyses by independent organizations.

Fentanyl Seizure Location Breakdown (FY 2023)

This table is critical for understanding where fentanyl is being smuggled. The data overwhelmingly shows that the primary points of interdiction are official Ports of Entry and vehicle checkpoints, not remote areas between ports.

Sources: Data synthesized from reports by DHS, CBP, and the American Immigration Council. The “Between POEs / Other” category includes seizures by U.S. Border Patrol between official crossings as well as at interior vehicle checkpoints.

Profile of Convicted Fentanyl Traffickers

This table addresses the question of who is smuggling fentanyl. Federal conviction data consistently shows that U.S. citizens make up the vast majority of convicted fentanyl traffickers.

Sources: U.S. Sentencing Commission and American Immigration Council analysis.

Major Challenges and Critical Perspectives

Despite a massive mobilization of resources, technology, and personnel, U.S. agencies face formidable and persistent challenges in their fight to stop the flow of fentanyl. The nature of the adversary, the economics of the drug trade, and the fundamental logistics of border management create a complex problem that defies simple solutions.

The Adaptable Enemy

Transnational Criminal Organizations are highly sophisticated, well-funded, and ruthlessly adaptive adversaries. They continually adjust their tactics, techniques, and procedures to circumvent law enforcement. If one smuggling route becomes too risky, they shift to another. If one concealment method is discovered, they invent a new one.

Most concerningly, their chemists are constantly working to create new fentanyl analogues and other synthetic opioids that may not yet be illegal or detectable by current field tests, keeping them one step ahead of the law. This constant evolution makes the threat a moving target, requiring law enforcement to be equally agile and predictive.

The Volume Problem

The single greatest operational challenge at Ports of Entry is the sheer volume of legitimate trade and travel. As noted, hundreds of thousands of vehicles cross the border daily. Even with the ambitious goal of scanning 40% of passenger cars with NII technology, this still leaves a majority of vehicles un-scanned.

TCOs understand this and exploit it. They are playing a numbers game where they only need to succeed a small fraction of the time to move enormous quantities of a highly potent drug, while CBP must be successful 100% of the time to stop it completely—an impossible task.

Economic Realities

Critical analysis from research organizations like the Cato Institute highlights the challenging economics of fentanyl interdiction. Because fentanyl is so potent, it can be smuggled in small quantities. Because it is so cheap to produce in Mexico relative to its street value in the U.S., cartels can absorb extremely high losses from seizures and still turn a massive profit.

This analysis suggests that even if CBP were to dramatically increase its seizure rate, it might not be enough to significantly impact the price or availability of fentanyl on American streets.

Furthermore, this perspective warns of a potential “doomsday” scenario: if law enforcement becomes too effective at stopping fentanyl, TCOs could pivot to producing and trafficking even more potent synthetic opioids, such as nitazenes, which are up to 20 times stronger than fentanyl and are already being detected in the U.S. drug supply. This would require far smaller quantities to be smuggled to supply the same market, making detection exponentially more difficult.

Civil Liberties Concerns

Civil liberties and immigration advocacy groups, such as the American Immigration Council and the ACLU, raise another critical perspective. They argue that the persistent and factually incorrect political narrative linking fentanyl smuggling primarily to migrants crossing between ports of entry is not only harmful and stigmatizing but also strategically flawed.

By focusing public fear and political capital on the wrong problem, this narrative risks misallocating finite law enforcement resources. It diverts attention and funding toward inter-port enforcement and away from the POEs, where over 90% of the fentanyl is actually crossing.

These groups argue that an effective strategy must align with the data and concentrate resources on bolstering security, technology, and personnel at the official ports of entry. Broader concerns about CBP practices, including allegations of racial profiling and inhumane treatment of migrants, further underscore the need for robust oversight to ensure that enforcement actions are not only effective but also lawful and humane.

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