California, United States of America
The following excerpt is from People v. Jackson, F064563 (Cal. App. 2013):
Further, in order to establish a claim of ineffective assistance of counsel, appellant must demonstrate both that counsel's performance fell below an objective standard of reasonableness (Strickland v. Washington (1984) 466 U.S. 668, 687-688) and that there is "a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different." (Id. at p. 694.) We need not determine whether counsel's performance was deficient if appellant fails to show prejudice. (Id. at p. 697.)
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