ensure that Sacagawea, whom North Dakotans consider to be one of their own, ultimately remains on the dollar coin. However, Federal Reserve officials indicated to Congress that "if the Presidential $1 Coin Program does not stimulate substantial transactional demand for dollar coins, the requirement that the Mint nonetheless produce Sacagawea dollars would result in costs to the taxpayer without any offsetting benefits." In that event, the Federal Reserve indicated that it would "strongly recommend that Congress reassess the one-third requirement." The one-third requirement was later changed to one-fifth by the Native American $1 Coin Act, passed on September 20, 2007. Previous versions of the act called for removing from circulation dollar coins issued before the Sacagawea dollar, most notably the Susan B. Anthony dollar, but the version of the act which became law merely directs the Secretary of the Treasury to study the matter and report back to Congress. The act required federal government agencies (including the United States Postal Service), businesses operating on federal property, and federally funded transit systems to accept and dispense dollar coins by January 2008, and to post signs indicating that they do so. Minting errors On March 8, 2007, the United States Mint announced, that on February 15, 2007, an unknown number of George Washington Presidential $1 coins were released into circulation without their edge inscriptions (the U.S. mottos, "In God We Trust" and "", the coin's mint mark, and its year of issuance; i.e. (where is either or )). Ron Guth, of the Professional Coin Grading Service, estimated at least 50,000 coins were released without the edge inscriptions. The first such coin discovered was sold on eBay for , while later coins were selling for , as of late March 2007. Because one of the inscriptions missing from the coins is the motto "In God we trust", some articles on the subject have referred to them as "Godless dollars". Fake "Godless dollars" have been produced with the edge lettering filed off. Also, John Adams Presidential dollars have been discovered with plain edges. They are fewer in quantity than George Washington plain-edge dollars, making them rarer, thus more expensive. A more frequently encountered edge lettering error for the John Adams dollar is a coin with doubled edge lettering. This error occurs when a coin passes through the edge lettering machine twice. Most examples of the doubled-edge-letter John Adams dollar are from the Philadelphia Mint