I’m a little confused by your language here. Is he in “parole” or “probation” for life? You mention probation but keep saying “parole officer”. They are two totally different things.
If he got violated on “parole”, the parole officer can arrest him on the spot and return him to the prison from which he was released.
If he’s on probation, the probation officer has to file a violation warrant which then needs to be signed by a judge and then he gets arrested but he will be sent to court before being sentenced and he will have a chance to fight (and win against) the violation of probation.
He can also file a motion to modify his probation.
One last thing – WHO THE HELL GETS PUT ON PROBATION FOR LIFE FOR CHATTING WITH SOMEONE EVEN IF IT IS A STING OPERATION???