California, United States of America
The following excerpt is from People v. Cooper, C050697 (Cal. App. 5/16/2007), C050697 (Cal. App. 2007):
(2) Defendant's claim that her admission was not knowingly entered is a challenge to the validity of that admission. As such, a certificate of probable cause for the challenge is required. (Pen. Code, 1237.5.) Since defendant has not obtained the required certificate, review of the issue is not available. (People v. Mendez (1999) 19 Cal.4th 1084, 1097.)
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