Probation officers pop in all the time. You know...just to say “Hi, how’s it going?” while they look around for stray beer bottles, or worse. Knew a guy that tweeked and sat around looking through a slit in the curtains, waiting for his PO to show. Otherwise, he’d have just sat around looking through a slit in the curtains.
No big difference between probation officers and cops.
Both work for government, both have powers of arrest, and both likely belong to government unions.