Collecting $1 Dollar Coins

Can it be true that the US government is stockpiling dollar coins to the tune of $1 Billion dollars.  According to this article on NPR that is exactly what has happened.  

See the full article here:

According to the report there is a government program that requires their production and they have been stock piling unused since 2007 and the U.S. Mint continued to make them under this mandate until the program ended in 2016.