The Federal Reserve Board published research compiling Federal Reserve and United States Secret Service data to estimate the volume of counterfeit U.S. banknotes in circulation and to describe counterfeit passing activity by denomination, location, and counterfeit type. The paper estimates the total stock of counterfeits in the United States at no more than about USD 30 million (around 1 in 40,000 notes) and likely about USD 15 million (around 1 in 80,000 genuine notes), in both piece and value terms. This is lower than the estimate of 1 in 10,000 notes reported in Treasury (2006) using similar methods and sources, with the decline attributed in part to increased circulation of higher-security banknotes and greater public education on banknote security features. For counterfeits of reasonable quality, losses to the U.S. public from high-quality counterfeits of the most commonly used notes (USD 20 and smaller denominations) are described as minimal, although estimates vary by denomination.