What is the test for misconduct in the criminal justice system?

The Fourteenth Amendment to the United States Constitution is violated when a prosecutor's misconduct infects the trial with such unfairness as to deny due process. (People v. Tully (2012) 54 Cal.4th 952, 1009.) The misconduct must be significant enough to deny a fair trial. (Ibid.) Even if the prosecutor's misconduct does not result in a fundamentally unfair trial, California law is violated if the prosecutor used deceptive or reprehensible methods in attempting to persuade the jury or the court. (Id. at pp. 1009-1010.) Prosecutorial misconduct, however, will not result in reversal of a defendant's conviction unless it is reasonably probable the defendant would have obtained a result more favorable without the misconduct. (Id. at p. 1010.)