Can an inmates sentence be changed without their knowledge?

No, and inmate's sentence cannot be changed without one of the two sides filing a motion to change the sentence. If the prosecution wants more time added to a sentence, they file a motion and give their reasons. They have to deliver this motion to the defense side upon filing. If the judge ruled against the offender, there would definitely be a notice. The RSTAT program is the Residential Substance Abuse Treatment for a State Prisoner. There may very well be an incentive for taking the program like giving some time off.