What is the current state of the law on personal attacks on the integrity of opposing counsel?

"Although counsel have broad discretion in discussing the legal and factual merits of a case [citation], it is improper to . . . resort to personal attacks on the integrity of opposing counsel [citation]." (People v. Bell (1989) 49 Cal.3d 502, 538.) "If there is a reasonable likelihood that the jury would understand the prosecutor's statements as an assertion that defense counsel sought to deceive the jury, misconduct would be established." (People v. Cummings (1993) 4 Cal.4th 1233, 1302.) " '[A] "prosecutor is [also] prohibited from vouching for the credibility of witnesses or otherwise bolstering the veracity of their testimony by referring to evidence outside the record." [Citation.]' " (People v. Redd (2010) 48 Cal.4th 691, 740.)