There have been over 2,200 exonerations in the United States since 1989. (The National Registry of Exonerations) http://www.law.umich.edu/special/exoneration/Pages/about.aspx
The Arizona Justice Project receives, on average, 400 requests for assistance each year.
The Arizona Justice Project has represented more than 50 prisoners in post-conviction relief proceedings or before the Arizona Board of Executive Clemency.
16 of the Arizona Justice Project’s clients have been released in the past 6 years.