question. Moreover, Alcantara’s credibility was severely undermined by his admissions that he had been convicted of illegal reentry in 1995, 1997, 2002, and 2009. Notably, Al-cantara was arrested for illegal reentry on two occasions after traveling into the United States from Tecate. Alcantara also conceded that he lied during a prior arrest when he falsely stated that he had never used methamphetamine. Although the prosecutor did improperly vouch for government witnesses by mentioning during rebuttal argument that the border patrol agents were “sworn to uphold the law,” the district court immediately sustained the defense attorney’s objection, and instructed the jury to disregard the comment, rendering any error harmless. See United States v. Parks, 285 F.3d 1133, 1141 (9th Cir.2002) (<HOLDING>). The district court did not abuse its
holding mistrial not warranted for improper statement by police officer where court sustained defendants objection and admonished jury to disregard statement and where there was overwhelming evidence of guilt holding that a jury is presumed to heed the district courts instruction to disregard the fact that the defendants were held in contempt and admonished before the jury holding that the district court did not abuse its discretion in denying the defendants request for severance because the district court nullified any prejudicial error when it repeatedly admonished the jury throughout the trial to consider the evidence only against the defendant to whom it related and at the end of trial gave the jury instructions that admonished the jury to consider separately each offense and evidence in support of each offense holding that the district courts improper admission of an unauthenticated registration statement was harmless because the proponent of the registration statement later properly authenticated the statement in a motion to reconsider holding that improper statement was rendered harmless because the district court sustained the defendants objection  and admonished the jury to disregard the statement