California, United States of America
The following excerpt is from People v. J.K. (In re J.K.), A151053 (Cal. App. 2018):
To demonstrate ineffective assistance of counsel, a defendant must first show counsel's performance was "deficient" because her "representation fell below an objective standard of reasonableness . . . [] . . . under prevailing professional norms." (Strickland v. Washington (1984) 466 U.S. 668, 687-688.) Prejudice is shown when there is a "reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different. A reasonable probability is a probability sufficient to undermine confidence in the outcome. [Citation.]" (In re Sixto (1989) 48 Cal.3d 1247, 1257.)
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