Meet the average modern Texas prisoner, released in 2009. He spent 2.8 years behind bars -- 32 percent more time than his average prisoner predecessor released in 1990. If he was busted for a violent crime, he spent 5.3 years locked up, a 44 percent increase from his predecessor in 1990. You've spent a hell of a lot of tax dollars keeping Mr. Average Prisoner in the clink, according to this Pew Center study on prison tems, which didn't phrase it quite that way.
Pew crunched the numbers for Texas: $1,783 (average one-month prison stay) x eight months (average increase from 1990 to 2009) = $14,682/prisoner. If you multiply that by the amount of prisoners released in 2009, you get $620.1 million dollars, the amount taxpayers have spent keeping people in prison longer.