In conditional sentence cases, the person under house arrest is assigned to an official probation officer and subject to a concrete supervision plan. The probation officer takes charge of the inmate, a term they continue to use even if the person is serving their sentence at home.
Where the police are concerned, it goes back to other comments about communication. Once the inmate is released, no one is assigned the file for supervision, not even the investigator in charge of the file. Therefore, there is no concrete plan to guarantee that conditions are fully met.