Imprisonment and co-offending: results from a 10-year follow-up study

A recurring question in criminological research is whether prisoners meet new accomplices in prison. This article’s objective is to study co-offending among individuals who have served prison sentences. The frequency of co-offending among individuals who have been in the same prison at the same time will be examined. If gender, age, type of prison, offence type and prior experience of co-offending are significant for this type of co-offending will also be examined. The study population comprised all inmates released from a Swedish prison during a half year in 2001–2002 (n = 3.930). The follow-up period is 10 years. The results show that only 3% of those who have been in the same prison at the same time are suspected of committing offences together subsequent to release. The likelihood of being suspected of committing an offence together following the conclusion of a joint stay in the same prison is higher for those released from a closed prison who are aged 31–40, and who had committed large proportion of their offences together with others prior to the relevant prison sentence. The results suggest that the concept of criminal capital is not important for future co-offending after a joint stay in prison.