California, United States of America
The following excerpt is from People v. Hayes, 238 Cal.Rptr.3d 120, 27 Cal.App.5th 340 (Cal. App. 2018):
A defendant has a constitutional right to testify in his or her own defense, but does not have a right to testify falsely. ( Nix v. Whiteside (1986) 475 U.S. 157, 173, 106 S.Ct. 988, 997, 89 L.Ed.2d 123, 138.) A defense attorney has an obligation to act as a conscientious and diligent advocate, but "[i]t is utterly reprehensible for an attorney at law to actively procure or knowingly countenance the commission of perjury. [Citation.]" ( In re Jones (1971) 5 Cal.3d 390, 400, 96 Cal.Rptr. 448, 487 P.2d 1016.) A defendant's right to testify does not trump an attorney's ethical responsibilities. ( Whiteside , at p. 173, 106 S.Ct. at p. 997, 89 L.Ed.2d at p. 138 ].)
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