A Tristate mint is under investigation by the federal government for mail fraud, according to warrants used to raid and search their Stockwell Rd. offices. Liberty Dollar of Evansville produces what is known as a private voluntary barter currency designed as an alternative to Federal Reserve Notes produced by the US Mint. Liberty Dollar creator Bernard von NotHaus created the currency based on his belief that money should be backed by precious metals like gold or silver. Federal Reserve notes used to be based on gold, and then silver, but that policy was abandoned in the 1930s. Bernard von Nothaus' currency has a following across the country among those who want to see the gold or silver back the US currency again. He has been producing Liberty Dollars for about a decade, but recently became involved in a lawsuit against the US Mint. He is asking a judge to order the Mint to rescind it's statement that circulating Liberty Dollars is criminal. Bernard von Nothaus believes the raid on his Evansville office was retribution for his suit. For more on the raid, link to the Liberty Dollar web site and view the warrants. UPDATE FRIDAY: In a warrant posted on the Liberty Dollar website, the United States District Court alleges the company that makes liberty dollars was participating in mail fraud and money laundering. There is little other information about the charges and Liberty Dollar founder Bernard von Nothaus says his company will be cleared of any wrongdoing.