Police Conduct: Search Without a Warrant and Probation,

My question involves police conduct in the State of: california

my son was sentenced to 1 year of probation with a 4th waiver included (police could search without a warrant). The year was up over a couple of months ago.
How are the police made aware that they cannot search without a warrant anymore? does the system automatically purge the details re the probation, or does my son
have to petition the court to make law enforcement aware that probation is completed?

Police Conduct: Search Without a Warrant and Probation,