It is probably a violation of parole or probation.Quoting bbjones
What it is depends on what the order is that compels the person to remain at the halfway house. If they are there of their own free will and not subject to probation or parole restrictions, then it is the individual's own treatment he or she is effecting. If there is a supervised release order compelling attendance and residence at the facility, then it is that release order that would be violated.
- Carl

