$74 billion in U.S. taxpayer money is spent annually to offset correction costs for America’s 2.2 million prisoners (who represent 22% of the entire world prison population). APDS is helping fix that problem
This decrease in disciplinary action leads to cost reductions for corrections departments that use APDS—each tablet costs about $1,000, but Grewe estimates that in the long run municipalities can save between $3,000 and $5,000 per inmate.
http://observer.com/2016/10/can-giving-prisoners-android-tablets-save-taxpayers-money/