As the violence spread, billions of dollars of cartel cash began to seep into the global financial system. But a special investigation by the Observer reveals how the increasingly frantic warnings of one London whistle-blower were ignored – The Observer, Sunday 3 April 2011

Martin Woods, a Liverpudlian in his mid-40s, joined the London office of Wachovia Bank in February 2005 as a senior anti-money laundering officer. He had previously served with the Metropolitan police drug squad. As a detective he joined the money-laundering investigation team of the National Crime Squad, where he worked on the British end of the Bank of New York money-laundering scandal in the late 1990s.

Woods talks like a police officer – in the best sense of the word: punctilious, exact, with a roguish humour, but moral at the core. He was an ideal appointment for any bank eager to operate a diligent and effective risk management policy against the lucrative scourge of high finance: laundering, knowing or otherwise, the vast proceeds of criminality, tax-evasion, and dealing in arms and drugs.

Woods had a police officer’s eye and a police officer’s instincts – not those of a banker. And this influenced not only his methods, but his mentality. “I think that a lot of things matter more than money – and that marks you out in a culture which appears to prevail in many of the banks in the world,” he says.

Woods was set apart by his modus operandi. His speciality, he explains, was his application of a “know your client”, or KYC, policing strategy to identifying dirty money. “KYC is a fundamental approach to anti-money laundering, going after tax evasion or counter-terrorist financing. Who are your clients? Is the documentation right? Good, responsible banking involved always knowing your customer and it still does.”

When he looked at Wachovia, the first thing Woods noticed was a deficiency in KYC information. And among his first reports to his superiors at the bank’s headquarters in Charlotte, North Carolina, were observations on a shortfall in KYC at Wachovia’s operation in London, which he set about correcting, while at the same time implementing what was known as an enhanced transaction monitoring programme, gathering more information on clients whose money came through the bank’s offices in the City, in sterling or euros. By August 2006, Woods had identified a number of suspicious transactions relating to casas de cambio customers in Mexico.

Read the whole story here – http://www.theguardian.com/world/2011/apr/03/us-bank-mexico-drug-gangs?goback=%2Egde_1799642_member_5814800102346227712#%21 = The Observer, Sunday 3 April 2011