United States v. Pritchard
993 F. Supp. 2d 1203 · District Court, C.D. California · 2014
Facts
Three men wearing ski masks and gloves robbed the Downey Savings and Loan in Costa Mesa, stealing over $120,000. They fled in a car, then switched to a Toyota Sequoia, which police pursued in a 45-mile high-speed chase that ended when the Sequoia crashed into a tree at a Los Angeles shopping mall. The driver was arrested, one fleeing robber was caught, and three others escaped, later identified as Joseph Pritchard, Ronnie Johnson, and Marvin Sanders. A crime scene investigator collected evidence from the crashed car, including a ski mask, a 9mm pistol, a Superman baseball hat, and DNA swabs from the interior windshield. DNA analysis by the Government's expert, Jeanne Putinier, concluded that DNA from the Superman hat and pistol matched Johnson, and DNA from the ski mask and windshield matched Pritchard.
Issue
Should the Government's DNA expert's statistical analysis testimony, which calculates the probability of a coincidental DNA match, be excluded under Federal Rule of Evidence 702 due to alleged lack of qualification or unreliable methodology, under the Confrontation Clause for relying on external sources, or under Federal Rule of Evidence 403 due to potential unfair prejudice?
Holding
No, the DNA expert's statistical analysis testimony is admissible. The court denied the defendants' motion in limine to exclude the testimony, finding that the expert was qualified, her methodology was reliable under Rule 702, her testimony did not violate the Confrontation Clause, and its probative value was not substantially outweighed by the danger of unfair prejudice under Rule 403.
Rule
Under Federal Rule of Evidence 702, expert testimony is admissible if the expert is qualified by knowledge, skill, experience, training, or education, and the testimony is based on sufficient facts, reliable principles/methods, and reliably applied. Reliability is assessed using Daubert factors, including testability, peer review, error rate, standards, and general acceptance. The court found the expert qualified by extensive education, training, and experience, and her methodology (the product rule) reliable as it is extensively tested, peer-reviewed, has an acceptable error rate, follows established standards, and is generally accepted in the scientific community. The Confrontation Clause is not violated by an expert's reliance on non-testimonial external sources like published population databases. Under Federal Rule of Evidence 403, evidence is excluded if its probative value is substantially outweighed by unfair prejudice; here, the high probative value of statistical DNA evidence outweighed potential prejudice, as the court was confident the jury would not be misled.
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