Perdue v. United States

How later courts describe this case

• holding that DQ Alpha and polymarker testing are sufficiently reliable under Daubert and have achieved general acceptance within relevant scientific community
• which listed, at 1147, n. 4, fifteen state appellate courts admitting DNA evidence derived from the PCR methodology
• PCR analysis reliable and admissible under the standard established by Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579, 113 S.Ct. 2786, 125 L.Ed.2d 469 (1993)
• “Impermissible vouching may ... occur when the government implies a guarantee of a witness’s truthfulness, refers to facts outside the record, or expresses a personal opinion as to a witness’s credibility”