What is the effect of a plea of guilty in a criminal case?

Ucci's challenge to the evidence supporting the trial court's findings that he violated his probation are of no consequence in view of his admission to the probation violation. (See People v. Turner, supra, 171 Cal.App.3d at p. 125 ["[A] plea of guilty waives any right to raise questions regarding the evidence, including its sufficiency or admissibility, and this is true whether or not the subsequent claim of evidentiary error is founded on constitutional violations."].) Ucci's contentions that the probation officer falsified the desertion report that led to his imprisonment, and that the court relied on such falsehoods in its decision, are not supported by the record.⁷