Nigeria has acquired a terrible worldwide reputation for corruption and financial crimes, including 419 scams. The BBC's Yusuf Mohammed profiles the man tasked with fighting the fraudsters.
When Nuhu Ribadu was appointed to run the Economic and Financial Crimes Commission, which was set up three years ago, he memorably told a reporter that his ambition was to bring the rich and the powerful to justice.
But during that time, he has discovered just what a difficult job he has.
Despite his successes, Nigeria remains ranked as the world's third most corrupt county by Transparency International, much to the annoyance of President Olusegun Obasanjo, who placed the war against corruption at the heart of his administration. The 45-year-old policeman maintains that the battle against money-laundering and other forms of financial crimes is winnable, even in Nigeria. Obasanjo has talked tough on corruption since 1999. But he stresses that it is vital that the judiciary, and Nigerians as a whole, need to accept how damaging financial crime is to the country.
He compares his battle to that the Americans are waging against terrorism.