People v. Keller

State presented evidence sufficient to prove that Defendant violated terms of his probation, thus court properly revoked Defendant's probation, in unambiguous testimony of probation officer that Defendant failed to appear at his office for a scheduled random drug test. Court's comment on lack of corroboration for Defendant's version of events was remark on court's weighing of evidence, rather than shifting burden from State to Defendant. Unified Code of Corrections, Section 5-6-4, allows probation officer to file petition for probation violation.