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How Law Enforcement Tracks Money Laundering

TrueCrime.World May 5, 2026

Money laundering fuels crimes like drug trafficking, corruption, and terrorism by disguising illegal funds as legitimate. Law enforcement uses advanced tools, financial reports, and global partnerships to disrupt these activities.

Here's how they combat it:

Suspicious Activity Reports (SARs): Banks flag unusual transactions under the Bank Secrecy Act, aiding investigations.
Forensic Analysis: Tools like blockchain analysis trace illicit funds through complex financial networks.
Key Agencies: The FBI, FinCEN, and IRS play critical roles, alongside international collaborations like the Financial Action Task Force.
AI Technology: Machine learning identifies patterns in financial data, improving detection speed and accuracy.
Legal Frameworks: Federal laws such as 18 U.S.C. § 1956 and § 1957 prosecute offenders with severe penalties.

Money Laundering Detection Statistics and Global Impact 2023-2026

How to Detect Money Laundering | Identifying Suspicious Transactions | How to Stop Money Laundering

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How Law Enforcement Detects Money Laundering

Law enforcement tackles money laundering with a layered approach, blending institutional oversight with cutting-edge forensic tools to track illicit financial activities. Here's how financial alerts and transaction tracing help transform raw data into actionable leads.

Financial Institution Alerts and SARs

The Bank Secrecy Act (BSA) requires banks to implement Anti-Money Laundering (AML) programs, including risk assessments, Customer Due Diligence, and automated transaction monitoring systems. These systems flag unusual activity, prompting banks to file Suspicious Activity Reports (SARs) with FinCEN. SARs serve as time-stamped evidence, providing details that can uncover hidden assets, accomplices, and links to broader criminal operations.

According to the FinCEN 2023 Year in Review , 94% of users accessing the BSA portal found data that advanced their investigations , and the same percentage reported discovering new information critical to their cases.

Some common red flags that lead to SAR filings include:

"Smurfing" : Breaking large sums of cash into smaller deposits to avoid the $10,000 reporting threshold.
Manipulated invoices in trade-based schemes.
Cryptocurrency-specific activities, such as "chain-hopping" (moving funds across multiple blockchains) or using crypto mixing services.

Tracing Transactions and Funds

Once suspicious activity is identified, forensic analysis comes into play. Investigators use advanced tools and forensic accounting to follow the money trail, uncover hidden networks, and map out illicit operations. Modern Virtual Financial Investigation (VFI) tools have significantly reduced the time needed for analysis - from months to mere hours - while maintaining data integrity.

For example, in a case involving a multi-state trafficking ring, law enforcement subpoenaed hotel payment records after rescuing victims. The financial data revealed a clear pattern of money flowing from buyers to victims and then to a single individual in another state. This evidence not only exposed the trafficking network but also led to asset seizures that dismantled the entire operation.

In cryptocurrency cases, blockchain analysis has become indispensable. In April 2026, authorities seized $344 million in Tether (USDT) after OFAC flagged connections to the Central Bank of Iran and illicit activities in the Strait of Hormuz.

"Financial evidence is one of the clearest, most reliable indicators of where and when a crime was committed, who benefited and where justice should be served." – Legal Reader

The scale of digital money laundering is staggering. Since 2019, nearly $100 billion has flowed from illicit cryptocurrency wallets to conversion services. Investigators now routinely track funds through the three key stages of laundering - placement, layering, and integration - using both traditional banking systems and blockchain technology to identify the ultimate beneficiaries of criminal enterprises.

Key Agencies That Combat Money Laundering

Federal Law Enforcement Agencies

In the United States, combating money laundering involves several federal agencies, each with specific responsibilities. Take FinCEN (Financial Crimes Enforcement Network), for example. It enforces the Bank Secrecy Act and collects crucial financial data. By April 2026, FinCEN's Rapid Response Program had successfully blocked nearly $2 billion linked to cyber-enabled fraud targeting U.S. victims.

The FBI plays a major role through its Money Laundering, Forfeiture, and Bank Fraud Unit (MLFBU), which aids investigations nationwide. Recently, the FBI has focused on "professional gatekeepers" - accountants, lawyers, and brokers - who facilitate laundering for a fee. This approach disrupts entire criminal enterprises more effectively than chasing individual offenders. The FBI's BSA Alert System generates about 2,000 automated alerts monthly for agents, and between January 2017 and June 2018, BSA reports were directly connected to the main targets in about 25% of the FBI's pending investigations.

The IRS Criminal Investigation Division (IRS-CI) zeroes in on tax-related money laundering and ensures Money Services Businesses comply with the Bank Secrecy Act. Meanwhile, the DEA targets the financial backbone of drug trafficking through its Organized Crime Drug Enforcement Task Forces (OCDETF), which pool resources from 10 federal agencies. In December 2025, a FinCEN-led operation focusing on southwest border Money Services Businesses analyzed over 1,000,000 Currency Transaction Reports and 87,000 Suspicious Activity Reports. This effort led to six investigation notices and numerous IRS referrals for further examination.

"At President Trump's direction, the Treasury Department is utilizing all tools to stop terrorist cartels, drug traffickers, and human smugglers. This sweeping operation will help root out potential cartel-related money laundering from the U.S. financial system." - Scott Bessent, Secretary of the Treasury

Working with International Partners

While U.S. agencies lead domestic efforts, international teamwork is just as crucial. Money laundering knows no borders, making global cooperation essential. The U.S. collaborates through the Financial Action Task Force (FATF) to shape anti-money laundering policies worldwide and through the Egmont Group , which connects over 100 Financial Intelligence Units for intelligence sharing. Additionally, the Five Eyes Law Enforcement Group (FELEG) enables direct coordination with Australia, Canada, New Zealand, and the United Kingdom to dismantle cross-border criminal operations.

The REPO Task Force (Russian Elites, Proxies, and Oligarchs), spearheaded by the Treasury Department, partners with foreign governments to exchange information on sanctions, freeze assets, and prosecute crimes. Another initiative, the Kleptocracy Asset Recovery Initiative led by the DOJ, targets corrupt foreign officials. For instance, in October 2014, the DOJ settled with Teodoro Nguema Obiang Mangue, the Second Vice President of Equatorial Guinea, who funneled over $300 million in corruption proceeds into U.S. assets like luxury real estate and vehicles via shell companies.

From December 2018 to November 2025, financial institutions flagged approximately $7.1 billion in suspected transactions tied to Chinese Money Laundering Networks (CMLNs). Since August 2025 alone, over 500 Suspicious Activity Reports specifically mentioned CMLN-related activities.

"Malicious Chinese individuals engaged in money laundering pose one of the most significant threats facing the U.S. financial system." - Andrea Gacki, FinCEN Director

Technology Used in Money Laundering Investigations

AI and Machine Learning for Transaction Monitoring

Law enforcement agencies are increasingly turning to artificial intelligence (AI) and machine learning (ML) to tackle the monumental task of analyzing vast amounts of financial data. These technologies excel at identifying patterns that hint at suspicious activities - things like unusually fast transaction speeds, sudden account activity spikes, or transfers involving countries flagged as high-risk. Unlike older rule-based systems, AI and ML can spot anomalies that traditional methods might overlook.

Here's how it works: supervised learning trains algorithms using historical data from prior cases, helping them recognize red flags based on past patterns. Meanwhile, unsupervised learning identifies new, suspicious behaviors without needing pre-labeled examples, making it adaptable to evolving criminal tactics. These systems also use behavioral analysis to establish "normal" transaction patterns for each customer, flagging deviations that may indicate illegal activity.

For example, in April 2026, DailyPay - a company managing $30 billion annually - adopted agentic AI from ComplyAdvantage to streamline flagged transaction reviews. This upgrade cut the workload for human analysts by 50% , enabling the team to keep up with rising transaction volumes without expanding their workforce. Similarly, Australia Post implemented the Napier AI Continuum platform on Microsoft Azure in 2025, reducing false positives by half. Freemarket also leveraged AI-driven tools to review financial crimes 77% faster.

Another game-changer is "Explainable AI" , which provides clear, plain-language reasons for why a transaction was flagged. This feature helps investigators quickly decide whether a case needs escalation or can be dismissed. The global market for anti-money laundering (AML) software, fueled by demand for real-time AI-powered monitoring, is projected to hit $3.2 billion by 2025. While AI enhances transaction monitoring, blockchain analysis takes on the challenge of tracing digital financial trails.

Blockchain Analysis Tools

Cryptocurrencies, with their public ledgers, leave behind a digital trail that investigators can follow using specialized blockchain analysis tools. These tools track funds originating from illegal activities as they move through intermediary wallets and eventually reach exchanges where criminals attempt to cash out. By combining on-chain data with "Know Your Customer" (KYC) information from regulated exchanges, investigators can often link anonymous wallet addresses to real-world identities.

Between July 2024 and July 2025, the International Consortium of Investigative Journalists used tools like Arkham Intelligence and Tronscan to examine tens of thousands of transactions tied to the Huione Group. Their efforts uncovered $408 million in tether flowing from Huione addresses to Binance deposit accounts, and another $226 million to OKX accounts. To validate their findings, they employed Python scripts and PostgreSQL databases. In January 2026, Indianapolis Police apprehended Julian Wachner for purchasing child sexual abuse material after TRM Labs traced the flow of funds through multiple intermediary wallets to a seller's address.

"Blockchain intelligence can change the starting point and accelerate the identification of perpetrators. When cryptocurrency is used as a payment rail, investigators can begin with financial traces." - TRM Team

Emerging technologies are also pushing boundaries. For instance, in 2025, the TwoStepALWithCC algorithm was introduced, offering detection capabilities comparable to or better than existing methods while requiring up to 22% fewer labeled data samples. These advanced tools help investigators untangle complex laundering techniques, such as mixers, chain-hopping, and decentralized finance services. Beyond tracing illicit funds, they provide the critical evidence needed to build strong cases against money launderers.

Building a Case Against Money Launderers

Evidence Collection and Documentation

To build a strong case against money launderers, investigators need to collect admissible evidence that proves both the illegal origin of the funds and the defendant's intent. Key documents often include Suspicious Activity Reports (SARs) , Currency Transaction Reports (CTRs) , wire transfer records, and papers related to shell companies. These records help establish a clear financial trail, often revealing "layering" activities used to disguise the origin of funds.

The FBI's Racketeering Records Analysis Unit (RRAU) also plays a vital role by focusing on off-the-books records maintained by criminal organizations outside the formal banking system. Investigators further document ownership of assets such as real estate, precious metals, and virtual currencies. Forensic accountants are indispensable in this process, as they untangle complex financial data and craft clear, understandable narratives for juries.

"Forensic accounting helps uncover the origin and movement of illicit funds by meticulously analyzing financial records, identifying irregularities, and tracing transactions to their source." - Joe Easton, Experienced Federal Forfeiture-Seizure Attorney

One of the toughest hurdles in these cases is proving that the defendant knowingly participated in laundering activities. Prosecutors need to demonstrate that the defendant was aware the funds originated from a felony and intended to either promote unlawful activity, evade taxes, or conceal the source of the money. Preserving evidence that highlights deliberate involvement rather than accidental negligence is crucial for a successful prosecution.

This thorough documentation and evidence trail form the foundation for applying federal laws to prosecute money laundering cases.

Legal Frameworks and Prosecution

U.S. prosecutors primarily rely on two key federal statutes to charge individuals with money laundering. The first, 18 U.S.C. § 1956 , targets those who knowingly conceal proceeds of illegal activities. This statute carries a maximum sentence of 20 years in prison and fines of up to $500,000 or twice the value of the transaction, whichever is greater. The second statute, 18 U.S.C. § 1957 , applies to any transaction over $10,000 involving criminally derived property. Unlike § 1956, this statute does not require proof of intent to conceal and carries a maximum penalty of 10 years imprisonment.

Statute	Primary Focus	Transaction Threshold	Max Prison Term	Proof of Intent
18 U.S.C. § 1956	Intent to promote, conceal, or evade taxes	No specific threshold	20 years	Must prove specific intent
18 U.S.C. § 1957	Transactions in criminally derived property	Must exceed $10,000	10 years	No intent to conceal required

Prosecutors rely on a solid financial trail to meet the evidentiary standards set by these statutes.

The Bank Secrecy Act (BSA) provides the regulatory framework that makes these prosecutions possible. According to FinCEN, "The BSA's recordkeeping and reporting requirements establish a financial trail for investigators to follow as they track criminals, their activities, and their assets". Importantly, prosecutors don't need to prove that defendants knew the specific crime generating the funds - only that they were aware the property was illegally obtained.

A recent example of enforcement is the $4.3 billion settlement reached in November 2023 between Binance and U.S. authorities. This case highlighted how sanctioned actors exploited weak controls to move illicit cryptocurrency through mixers and cross-chain swaps.

Conclusion

The fight against money laundering demands a layered strategy that blends traditional investigative techniques with modern technology. Each year, an estimated $730 billion is laundered in the U.S. (2.5% of the national GDP), while the global figure reaches a staggering $5.5 trillion.

Technology has reshaped how financial crimes are tackled. For example, JPMorgan Chase reported a 95% drop in false-positive alerts by March 2024, thanks to AI-driven transaction monitoring, enabling teams to focus on genuine threats. Likewise, HSBC saw a fourfold boost in identifying financial crimes after adopting machine learning platforms in September 2025. However, as Daniel Stipano, Head of AML/CFT at Davis Polk, pointed out:

"Technology is a double-edged sword: while it is a powerful tool to fight financial crime, it also creates opportunities that are being exploited by illicit actors".

These advancements also strengthen international collaboration. Networks like the Egmont Group , which links over 100 Financial Intelligence Units globally, allow agencies to exchange intelligence and trace illicit funds across borders. The 94% of investigators who uncovered new leads using FinCEN's BSA portal highlights the value of shared financial data.

Yet, challenges remain. Crypto-related illicit flows tripled between 2024 and 2025, reaching $158 billion worldwide. During the same period, global AML fines fell by 18% , exposing the widening gap between increasing criminal activity and enforcement efforts. Criminals exploit regulatory gaps, leveraging stablecoins and blockchain techniques like "chain-hopping" to obscure their activities .

To counter these threats, law enforcement must prioritize investments in advanced tools and skilled personnel. Blockchain analytics, automated financial data analysis, and closer public-private partnerships with financial institutions are essential. By combining cutting-edge technology, international collaboration, and dedicated resources, authorities can stay ahead of increasingly sophisticated money laundering networks, as outlined in this analysis.

FAQs

What makes a bank file a SAR on someone?

A bank submits a Suspicious Activity Report (SAR) when it suspects or reasonably believes that a transaction or activity might be linked to criminal behavior, such as money laundering. These reports serve as a way to alert law enforcement, enabling them to investigate the suspicious activity further.

How do investigators link crypto wallets to real people?

Investigators link cryptocurrency wallets to individuals by examining blockchain transaction data and monitoring how funds move through exchanges and intermediaries. They rely on details such as public and private keys, transaction behaviors, and work alongside exchanges to match wallets with real-world identities.

What’s the difference between 18 U.S.C. § 1956 and § 1957?

The main distinction between the two statutes lies in their scope and focus. 18 U.S.C. § 1956 addresses money laundering activities, requiring evidence that the defendant intended to promote, conceal, or disguise the origins of illegal proceeds through financial transactions. Meanwhile, 18 U.S.C. § 1957 zeroes in on transactions exceeding $10,000 that involve illegal funds, emphasizing the monetary value and origin of the money. In short, § 1956 covers a broader range of laundering activities, while § 1957 specifically targets substantial financial transactions.