According to the Drug Policy Alliance, over $47 billion per year is spent on the War on Drugs, most of it in the states. Also, about 20% of the over 2.2 million people incarcerated in the U.S. are in prison for drug related crimes, so pardoning these people would free up about 20% of the $80 billion spent on incarceration per year, freeing up about another $16 billion.