Here are some facts about Maryland's prisons. They house 21,000 offenders, 35 percent of whom are incarcerated for nonviolent offenses. Fifty-eight percent of offenders who entered state prison last year were imprisoned for failing to comply with the terms of their probation or parole supervision, indicating that supervision could be improved. The No. 1 crime for offenders sentenced to prison is a drug offense. Despite the growing body of research demonstrating the diminishing public safety return of long prison sentences, offenders, regardless of crime type, are spending an average of 23 percent longer in prison than they did a decade ago.