If someone who has been found guilty of a crime or offence is given a non-custodial sentence, their punishment does not involve going to prison. [formal]
...non-custodial punishments for minor criminals.
2. adjective [ADJECTIVE noun]
The non-custodial parent in a couple who are separated or divorced is the parent who does not live with the children.
More than half the children of divorce did not see the non-custodial parent on a regular basis.