California, United States of America
The following excerpt is from The People v. Ramsey, 79 Cal.App.4th 621, 94 Cal.Rptr.2d 301 (Cal. App. 2000):
"In order to demonstrate ineffective assistance of counsel, a defendant must first show counsel's performance was 'deficient' because his 'representation fell below an objective standard of reasonableness . . . under prevailing professional norms.' [Citations.] Second, he must also show prejudice flowing from counsel's performance or lack thereof. [Citations.] 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.' [Citations.]" (People v. Jennings (1991) 53 Cal.3d 334, 357.)
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