In the Netherlands, the behavior-influencing and freedom-restricting measure (GVM) came into effect on 1 January 2018. The purpose of this measure is to enable long-term, if necessary, lifelong monitoring of perpetrators of sexual and serious violent crimes with a high risk of recidivism. The probation service advises on imposition and implementation of the measure. This article describes results of a small scale study on arguments that are used in practice to advise the GVM. The central question is whether the legislator provides probation officers with sufficient tools for substantiated advice to the court.