Approximately, 500 offenders on renewable temporary release sign on in any one week throughout the prison service. It is not possible to give an exact weekly figure of offenders signing on in each prison as the number changes daily with some offenders being granted full temporary release, some having their temporary release revoked and others commencing periods of temporary release.
The majority of those signing on do so on a weekly basis but some must do so on a three-day, fortnightly or monthly basis. It is important to distinguish between renewable temporary release, under which the offender must report back regularly to the prison and full temporary release, under which there is no obligation to return.
Overall, the prison service operates at or above capacity. For example, on Tuesday, 21 May 1996 the occupancy rate was over 99 per cent of the maximum prison capacity. Most prisons and places of detention operate from day to day without any vacancies. The exceptions would be Portlaoise Prison, where it is necessary for operational reasons to leave some cells vacant and some open centres which from time to time, due to the lack of availability of suitable offenders, may have some vacancies.