What is the standard of conduct of an attorney who makes personal attacks on the character or motives of the opposing party, counsel or witnesses?

"[I]t is vital to the integrity of our adversary legal process that attorneys strive to maintain the highest standards of ethics, civility, and professionalism in the practice of law." (People v. Chong (1999) 76 Cal.App.4th 232, 243, 90 Cal.Rptr.2d 198.) Indeed, unwarranted personal attacks on the character or motives of the opposing party, counsel, or witnesses are inappropriate and may constitute misconduct. (Id. at p. 245, 90 Cal.Rptr.2d 198; see also Stone v. Foster (1980) 106 Cal. App.3d 334, 355, 164 Cal.Rptr. 901.)

[138 Cal.App.4th 413]