Clean on Paper

How money laundering works

Money laundering is a plumbing problem: turning cash you can’t explain into wealth you can. This is a field guide to the pipes: the techniques, the cases that exposed them, and how they get caught.

Start with the basics Browse all techniques →

The three stages

Most laundering schemes move through three stages (placement, layering, and integration), first described this way by the Financial Action Task Force. Click a stage to see how it works and which techniques belong to it.

Stage 1

Placement

Dirty money enters the financial system. This is the riskiest moment, when cash first meets a record.

Stage 2

Layering

The trail is buried under transfers, entities, conversions, and borders until following it costs more than the money is worth.

Stage 3

Integration

The money re-enters as assets with their own paper trail: property, businesses, portfolios.

The techniques

Each technique page explains the mechanism, why it works, the red flags investigators look for, a real case, and how it gets caught.

  • Art, antiques and luxury goods

    Turning illicit funds into paintings, antiques, watches, or cars that are portable, hard to price, and easy to resell, so the money comes back as a sale.

    LayeringIntegration Assets Classic

  • Black Market Peso Exchange

    A peso broker buys a cartel's US drug dollars at a discount and uses them to pay US exporters for Latin American importers, who repay the broker in pesos at home.

    Layering Trade Classic

  • Bulk cash smuggling

    Physically carrying, shipping, or driving criminal cash across a border so it can be deposited or spent where it draws less attention and leaves no record in transit.

    Placement Cash Classic

  • Buying legitimate businesses

    Using illicit funds to buy or invest in real companies, so criminal wealth becomes an ordinary business portfolio that earns income with a paper trail.

    Integration Assets Classic

  • Cash-intensive front businesses

    A real-looking business that handles lots of cash books criminal money as sales, banks it, and pays tax on it, buying the money a legitimate history.

    PlacementIntegration Cash Classic

  • Casinos and gambling

    Dirty cash buys chips; minimal play and a cash-out turn it into documented gambling proceeds, a source of funds banks rarely question.

    PlacementLayering Gambling Classic

  • Chain hopping and cross-chain bridges

    Swapping illicit crypto across blockchains through bridges and no-KYC swap services so that no single chain's analytics tell the whole story.

    Layering Crypto Modern

  • Correspondent banking and wire layering

    Small or weakly supervised banks reach the dollar system through accounts at big correspondent banks, and rapid wires through many accounts and countries bury the origin of the money.

    Layering Banking Classic

  • Crypto ATMs and peer-to-peer trades

    Turning cash into cryptocurrency at a kiosk or with a peer-to-peer trader, so that dirty cash or scam payments land in a wallet the criminal controls.

    PlacementLayering Crypto Modern

  • Cuckoo smurfing

    Cuckoo smurfing hijacks a legitimate international transfer: criminal cash is deposited into an unwitting recipient's account while the clean money stays offshore.

    PlacementLayering Banking Modern

  • Currency exchanges and MSBs

    Using currency exchange houses, remitters, and other money services businesses to convert and send cash abroad, either through complicit operators or through firms whose controls are too weak to notice.

    PlacementLayering Banking Classic

  • Flying money: Chinese underground banks

    Chinese underground banks match cartel cash in the US with Chinese clients who want dollars outside China's capital controls: two mirrored payments, and no money crosses a border.

    Layering Informal value transfer Classic

  • Funnel accounts and money mules

    Recruited or deceived account holders receive and forward criminal money, so the bank's customer checks land on a real person who isn't the criminal.

    PlacementLayering Banking Modern

  • Gaming currencies and skins

    Buying in-game currency, items or gambling balances with stolen or illicit funds, then trading them on for clean-looking cash or crypto.

    PlacementLayering Digital Modern

  • Gold and precious metals

    Converting cash or dirty proceeds into gold, or booking them as gold sales, so the value can be melted, shipped, and sold again with the history gone.

    PlacementIntegration Assets Classic

  • Hawala and informal value transfer

    Moving value across borders through trusted brokers who pay out locally and settle with each other later: no money actually crosses, and no transaction record exists.

    Layering Informal value transfer Classic

  • Insurance products

    Cash-value life policies and annuities can turn unexplained money into an insurer's cheque, which looks like an ordinary maturity, loan, or surrender payout.

    LayeringIntegration Banking Classic

  • Loan-back schemes

    A loan-back scheme sends a person's own money offshore and returns it as a documented loan from a lender they secretly control, so the funds arrive with a paper explanation.

    LayeringIntegration Banking Classic

  • Mirror trading

    Two matched securities trades in different currencies and offices, placed by connected parties, work as a hidden currency swap that moves money out of a country with no transfer to flag.

    Layering Securities Modern

  • Mixers, tumblers, and CoinJoin

    Services that pool many users' coins and pay out equivalent amounts from the pool, breaking the on-chain link between where crypto came from and where it went.

    Layering Crypto Modern

  • NFT wash trading

    Buying and selling an NFT between wallets you control to fake a price, or to give illicit crypto the paper trail of an ordinary sale.

    LayeringIntegration Crypto Modern

  • Peel chains

    Splitting a large crypto balance into a long series of transactions, each sending a small amount onward and the rest to a new address, so the trail is slow and tedious to follow.

    Layering Crypto Modern

  • Prepaid cards and gift cards

    Turning cash or stolen funds into prepaid and gift cards that are easy to carry, hand over, and resell, so the value moves without a bank account or a wire.

    PlacementLayering Digital Modern

  • Privacy coins

    Cryptocurrencies with built-in features that hide who sent, who received, or how much, so a public blockchain no longer shows the whole story.

    Layering Crypto Modern

  • Professional enablers

    Lawyers, accountants, company formation agents, and real estate professionals whose ordinary services, knowingly or not, give illicit money a respectable paper trail.

    PlacementLayeringIntegration Banking Classic

  • Real estate

    Parking illicit funds in property through shell companies, trusts, and all-cash purchases, then drawing the money back out as clean-looking rent or resale proceeds.

    Integration Assets Classic

  • Round-tripping and fake foreign investment

    Money leaves a country, passes through an offshore company, and returns as foreign investment or a foreign loan, gaining a clean-looking origin and often better legal or tax treatment.

    LayeringIntegration Banking Classic

  • Sanctions evasion

    Hiding who really owns or benefits from assets and payments so sanctions do not bite, using many of the same tools as money laundering but often with lawfully earned money.

    LayeringIntegration Banking Modern

  • Securities and brokerage

    Brokerage accounts, offshore nominee accounts, and thinly traded microcap stocks can move and disguise value, because markets shift money instantly and legitimately.

    LayeringIntegration Securities Classic

  • Shell companies and nominees

    Companies with no real operations hold accounts and assets while nominee directors and stacked ownership across jurisdictions hide the true beneficial owner.

    Layering Banking Classic

  • Stablecoins and OTC brokers

    Moving illicit value through dollar-pegged stablecoins (above all USDT on Tron) and converting it to cash through over-the-counter brokers and guarantee marketplaces with little or no KYC.

    PlacementLayering Crypto Modern

  • Structuring (smurfing)

    Splitting cash into deposits just below the reporting threshold so no single transaction triggers a currency report.

    Placement Cash Classic

  • Trade based money laundering (TBML)

    Moving value across borders through trade paperwork: over- or under-invoicing goods, double-invoicing shipments, or invoicing shipments that never happened.

    Layering Trade Classic

  • Transaction laundering

    Running card payments for a hidden business through another merchant's legitimate processing account so the payment system sees only the front.

    Layering Digital Modern

  • Unlicensed exchanges and nested services

    Crypto exchanges that skip licensing and identity checks, and small services hidden inside big exchanges, that let criminals convert coins to cash without questions.

    LayeringIntegration Crypto Modern

The big cases

The schemes that defined modern anti-money-laundering enforcement: what happened, how each was found, and what changed afterwards.

  • Al Capone and the Money Laundering Myth

    Al Capone was convicted of tax crimes in 1931, not money laundering, and the laundromat origin story is folklore: the phrase came into use decades later.

    1931–1982

  • Operation Polar Cap (La Mina)

    A 1989 US operation dismantled a network that laundered about US$1.2 billion for the Medellín cartel by disguising drug cash as gold and jewelry sales, leading to 127 indictments.

    1987–1989 ≈ US$1.2 billion laundered

  • BCCI

    A bank built on layers of holding companies and nominees laundered drug money, was closed worldwide on July 5, 1991, and reshaped bank supervision.

    1972–1991 Operations in 73 countries

  • Wachovia

    In 2010 Wachovia admitted it failed to monitor more than US$420 billion in transactions with Mexican exchange houses and paid US$160 million, a record Bank Secrecy Act penalty at the time.

    2004–2008 > US$420 billion unmonitored

  • HSBC and the Sinaloa cartel

    Weak controls let Mexican and Colombian cartels move at least $881 million in drug money through HSBC, which paid a then-record $1.92 billion in 2012 to defer prosecution.

    2006–2012 US$1.92 billion penalty

  • The Russian and Troika Laundromats

    Two exposed schemes moved money out of Russia through offshore shell companies and small banks: about US$20 billion via fake loans and Moldovan courts, and US$8.8 billion via Troika Dialog.

    2006–2014 ≈ US$20 billion and US$8.8 billion

  • 1MDB

    More than US$4.5 billion was diverted from Malaysia's state fund through offshore shell companies into luxury property and Hollywood films, toppling a prime minister and costing Goldman Sachs billions.

    2009–2020 ≈ US$4.5 billion diverted

  • Panama Papers

    A 2016 leak of 11.5 million files from Mossack Fonseca exposed 214,488 offshore entities and showed how shell companies hide who owns what.

    2016–2024 11.5 million leaked records

  • Deutsche Bank Mirror Trades

    Deutsche Bank's Moscow and London desks ran matching stock trades that turned rubles into dollars offshore, moving about US$10 billion out of Russia and drawing fines from New York and London in 2017.

    2011–2015 ≈ US$10 billion moved out of Russia

  • Danske Bank Estonia

    About €200 billion flowed through the Estonian branch of Denmark's biggest bank between 2007 and 2015, much of it suspicious non-resident money hidden behind UK shell companies.

    2007–2015 ≈ €200 billion suspicious flows

  • The Vancouver Model

    Drug cash lent to Chinese high-roller gamblers through underground banks, washed through BC casinos and real estate, and repaid in China.

    2010s–2022 est. C$7.4 billion in BC (2018)

  • FinCEN Files

    A 2020 leak of more than 2,100 suspicious activity reports showed large banks moving suspect money, and helped push the US to its biggest AML overhaul in decades.

    1999–2021 ≈ US$2 trillion flagged

  • The Bitfinex hack laundering

    A married couple spent five years laundering 119,754 bitcoin stolen from the Bitfinex exchange, and the blockchain recorded every move.

    2016–2025 119,754 BTC

  • Cross-chain bridge hacks

    Bridges that move value between blockchains hold huge pools of funds, and the 2022 thefts from Ronin, Harmony, Wormhole and Nomad show how thieves launder them and how investigators respond.

    2022–2023 ≈ US$2 billion stolen from bridges in 2022 (Chainalysis, by August)

  • Lazarus Group

    North Korea's state hackers have stolen roughly US$6.75 billion in cryptocurrency and launder it at a speed no other criminal group matches.

    2016–present ≈ US$6.75 billion stolen

  • Tornado Cash

    The first sanctioned crypto mixer, a court ruling that limited the sanctions, and a developer trial whose outcome will define liability for privacy code.

    2019–present ≈ US$7 billion+ mixed (OFAC, 2022)

  • Binance

    The world's largest crypto exchange pleaded guilty to AML and sanctions failures and paid about US$4.3 billion, and its founder was later pardoned.

    2017–2023 ≈ US$4.3 billion in penalties

  • ChipMixer Takedown (2023)

    A darknet bitcoin mixing service that the US said processed over US$3 billion, seized by US and German police in March 2023 while its alleged operator stayed out of reach.

    2017–2023 US$3 billion+ processed (DOJ, 2023)

  • TD Bank

    The first US bank to plead guilty to money laundering conspiracy paid about US$3.09 billion after three networks moved over US$670 million through its accounts.

    2018–2024 ≈ US$3.09 billion in penalties

  • Huione and Prince Group

    A Cambodian financial group and a conglomerate tied to forced-labor scam compounds drew the largest sanctions and forfeiture actions ever aimed at Southeast Asian scam networks.

    2021–present ≈ US$4 billion (Huione); 127,271 BTC seized (Prince)

See the full case timeline →

Why it matters

The UN Office on Drugs and Crime estimated in 2011 that 2–5% of global GDP (roughly US$800 billion to US$2 trillion a year) is laundered, an estimate the UNODC itself calls uncertain. Europol’s 2016 study “Does crime still pay?” found that only about 1% of criminal proceeds in the EU are ever confiscated. Both figures are contested; that is part of the story. Laundering is what makes drug trafficking, fraud, corruption, and sanctions evasion pay. Detection, most of the time, still loses.

How detection works → · Reporting thresholds by country →

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