California, United States of America
The following excerpt is from People v. Fierro, F068387 (Cal. App. 2016):
"To be enforceable, a defendant's waiver of the right to appeal must be knowing, intelligent, and voluntary. [Citations.]" (People v. Panizzon (1996) 13 Cal.4th 68, 80.) An appellate court reviews de novo whether a waiver was valid. (Ibid.)
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