According to London's Metropolitan Police Company Fraud Department, potential targets in the UK and the USA alone receive c. 1500 solicitations a week. The US Secret Service Financial Crime Division takes in 100 calls a day from Americans approach by the con-men. It now acknowledges that "Nigerian organized crime rings running fraud schemes through the mail and phone lines are now so large, they represent a serious financial threat to the country". Sometimes even the stamps affixed to such letters are forged. Nigerian postal workers are known to be in cahoots with the fraudsters. Names and addresses are obtained from "trade journals, business directories, magazine and newspaper advertisements, chambers of commerce, and the Internet". Victims are either too intimidated to complain or else reluctant to admit their collusion in money laundering and fraud. Others try in vain to recoup their losses by ploughing more money into the scheme. Contrary to popular image, the scammers are often violent and involved in other criminal pursuits, such as drug trafficking, According to Nigeria's Drug Law Enforcement Agency. The blight has spread to other countries. Letters from Sierra Leone, Ghana, Congo, Liberia, Togo, Ivory Coast, Benin, Burkina Faso, South Africa, Taiwan, or even Canada, the United Kingdom, Oman, and Vietnam are not uncommon. The dodges fall into a few categories. Over-invoiced contract scams involve the ostensible transfer of amounts obtained through inflated invoices to the bank account of an unrelated foreign firm. Contract fraud or "trade default" is simply a bogus order accompanied by a fraudulent bank draft (or fake postal or other money order) for the products of an export company accompanied by demand for "samples" and various transaction "fees and charges". Some of the rackets are plain outlandish. In the "wash- wash" confidence trick people have been known to pay up to $200,000 for a special solution to remove stains from millions in defaced dollar notes. Others "bought" heavily "discounted" crude oil stored in "secret" locations - or real estate in rezoned locales. "Clearing houses" or "venture capital organizations" claiming to act on behalf of the Central Bank of Nigeria launder the proceeds of the scams. In another twist, charities, academic institutions, nonprofit organizations, and religious groups are asked to pay the inheritances tax on a "donation". Some "dignitaries" and their relatives may seek to flee the country and ask the victims to advance the bribe money in return for a generous cut of the wealth they have stashed abroad. "Bankers" may find inactive accounts with millions of dollars - often in lottery winnings - waiting to be transferred to a safe off-shore haven. Bogus jobs with inflated wages are another ostensible way to defraud state- owned companies - as is the sale of the target's used vehicle to them for an extravagant price. There seems to be no end to criminal ingenuity.