PDF Time Served: The High Cost, Low Return of Longer Prison Terms
As discussed in this report, the length of time served in prison has increased markedly over the last two decades. Prisoners released in 2009 served an average of nine additional months in custody, or 36 percent longer, than offenders released in 1990. Those extended prison sentences came at a price: prisoners released from incarceration in 2009 cost states $23,300 per offender–or a total of over $10 billion nationwide. More than half of that amount was for non-violent offenders.
The report also found that time served for drug offenses and violent offenses grew at nearly the same pace from 1990 to 2009. Drug offenders served 36 percent longer in 2009 than those released in 1990, while violent offenders served 37 percent longer. Time served for inmates convicted of property crimes increased by 24 percent.
Almost all states increased length of stay over the last two decades, though that varied widely from state to state.
The report also summarizes recent public opinion polling that shows strong support nationwide for reducing time served for non-violent offenders.