What is the test for a claim of improper conduct by a prosecutor?

"A prosecutor's conduct violates a defendant's constitutional rights when the behavior comprises a pattern of conduct so egregious that it infects '"the trial with unfairness as to make the resulting conviction a denial of due process." [Citation.]' [Citation.] The focus of the inquiry is on the effect of the prosecutor's action on the defendant, not on the intent or bad faith of the prosecutor. [Citation.] Conduct that does not render a trial fundamentally unfair is error under state law only when it involves '"'the use of deceptive or reprehensible methods to attempt to persuade either the court or the jury.'" [Citation.]' [Citation.]" (People v. Mendoza (2007) 42 Cal.4th 686, 700.)

"A defendant's conviction will not be reversed for prosecutorial misconduct, however, unless it is reasonably probable that a result more favorable to the defendant would have been reached without the misconduct. [Citation.] Also, a claim of prosecutorial misconduct is not preserved for appeal if defendant fails to object and seek an admonition if an objection and jury admonition would have cured the injury. [Citation.]" (People v. Crew (2003) 31 Cal.4th 822, 839.)