Post-Conviction Relief for Immigrants



 
 

§ 7.108 (G)

 
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(G)  Improper Prosecutorial Vouching.  Another form of prosecutorial misconduct is “vouching” for the veracity of witnesses or information:

 

Improper vouching occurs when: (1) the prosecutor places the prestige of the government behind a witness by expressing his or her personal belief in the veracity of the witness, or (2) the prosecutor indicates that information not presented to the jury supports the witness' s testimony.  United States v. Edwards, 154 F.3d 915, 921 (9th Cir. 1998).  Also, a prosecutor may not, for instance, express an opinion of the defendant' s guilt, United States v. Molina, 934 F.2d 1440, 1444 (9th Cir. 1991), denigrate the defense as a sham, United States v. Sanchez, 176 F.3d 1214, 1224 (9th Cir. 1999), implicitly vouch for a witness' s credibility, United States v. McKoy, 771 F.2d 1207, 1211 (9th Cir. 1985), or vouch for his or her own credibility, United States v. Smith, 962 F.2d 923, 933-34 (9th Cir. 1992).  Additionally, there is the “advocate-witness” rule, which prohibits an attorney from appearing as both a witness and an advocate in the same litigation.  United States v. Prantil, 764 F.2d 548, 552-53 (9th Cir. 1985).[387]

 

These errors may invalidate a sentence.

 


[387] United States v. Hermanek, 289 F.3d 1076 (9th Cir. May 15, 2002) (prosecutorial portrayal of selves as investigative team, using terms “we” and “us,” constitutes impermissible vouching; harmless error).

 

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