After decades of stability from the 1920s to the early 1970s, the rate of imprisonment in the United States has increased fivefold during the last four decades.

A summary of criminal justice characteristics of the population under correctional supervision in 1993 -- admission, type, release type, sentence length, escape

The conditions and characteristics of correctional facilities - overcrowded with rapid population turnover, often in old and poorly ventilated structures, a spa