In the UK, when offenders have gone through half of their sentence, they may be put in a probation period. During the period, the offenders can serve their remaining prison time outside of a detention facility with various limitations applied to their freedom. If an offender BREAKS the RULES, they will be RECALLED to prison by their probation practitioner (supervisor) to serve the remainder of their sentence in prison.
The fact is that 10,000 prisoners were recalled in 2020, but 60% of them committed no other crime. At the same time, the UK prison system has been under pressure from the high recall rate of offenders, so public service teams, including Catch22, are exploring possible alternatives in pilot service to solve the recall issue.