📄 Sidebar: population frequency qualifications — Thursday, May 11, 1995
📅 May 11 — Day 72
⚖️ Lance A. Ito🛡️ Peter Neufeld
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C:\DEPT103\CRIMINAL\1995\MAY\11\SIDEBAR-POPULATION-FREQUENCY-Q.DOC
TRIAL
▲ Day 72 of 167

Sidebar: population frequency qualifications

Date: Thursday, May 11, 1995 • Utterances: 15
Defense attorney Peter Neufeld challenged Dr. Robin Cotton's qualifications to testify about population frequency ranges and substructure in DNA evidence, arguing that this specialized topic requires a population geneticist or biostatistician rather than a molecular biologist. Judge Ito overruled the objection, and Neufeld secured a standing objection covering all of Cotton's frequency range testimony.
1 (The following proceedings were held at the bench:)
2 THE COURT:

All right. We are over at the side bar. Mr. Neufeld, I anticipate that you are going to raise foundational objections at this point regarding Dr. Cotton's qualifications to be making these estimates. Do you want to put that on the record?

3 MR. NEUFELD:

Thank you. There is two problems: One is that yesterday, I believe it was over my objection, the Court found her qualified to give expert testimony on statistical inferences to be drawn from evidence, but now we are talking about something even more complicated; we are talking about population substructure and the range of frequencies. And I think that that is something that falls directly within the expertise of a population geneticist or a biostatistician and merely not somebody who is merely a molecular biologist, such as Robin Cotton. And therefore, I don't believe there is a proper foundation for her giving an opinion on a range of frequencies or the range of variation in the world.

4 THE COURT:

Uh-huh.

5 MR. CLARKE:

I thought the Court overruled this objection two days ago, but again I think--

6 THE COURT:

We are about to actually get into the calculations themselves. I think we are about to see numbers at this point, and I anticipated that Mr. Neufeld was going to make the objections so I figured we might--since we are getting a board up, we might as well do it over here.

7 MR. SCHECK:

Thank you, your Honor.

8 MR. CLARKE:

Her qualifications are amply demonstrated under case law. The threshold for even reporting population frequency data are fairly low in comparison to a Frye hearing standard. And this witness I think has established not only her expertise in terms of education, but also training while at Cellmark for years. She is the supervisor of the reporting of frequency data and described the fact how the methods in place in the lab had been reviewed extensively by more than one population geneticist, including one on board who has verified that the methods that she is responsible for in the lab are appropriate.

9 MR. NEUFELD:

I would just note that there is a difference between her role as a director of the laboratory being able to do calculations and report frequencies, as opposed to her making--giving expert opinions as to what the range of frequencies are in the world for different ethnic or racial populations. Those are two different things. You may have qualified to do the former, but that doesn't mean she is qualified to do the latter, and I don't believe there has been a sufficient foundation for the latter.

10 THE COURT:

All right. I will overrule the objection.

11 MR. NEUFELD:

Just so the record is clear, there is a standing objection insofar as each time she either testifies to a frequency or testifies to population frequency ranges.

KEY QUOTE
12 THE COURT:

Right. This goes to her testimony as to all of these frequency range calculations.

13 MR. NEUFELD:

Thank you.

14 THE COURT:

All right. Thank you, counsel.

15 (The following proceedings were held in open court:)

Temperature

procedural

Key Quotes (4)

Peter Neufeld
we are talking about population substructure and the range of frequencies. And I think that that is something that falls directly within the expertise of a population geneticist or a biostatistician and merely not somebody who is merely a molecular biologist, such as Robin Cotton.
Core defense argument distinguishing molecular biology credentials from population genetics expertise — a meaningful technical distinction in DNA frequency analysis.
Peter Neufeld
there is a difference between her role as a director of the laboratory being able to do calculations and report frequencies, as opposed to her making--giving expert opinions as to what the range of frequencies are in the world for different ethnic or racial populations.
Neufeld draws a sharp line between administrative/operational competence and genuine scientific expertise — a strategic framing to limit Cotton's authority.
Peter Neufeld
Just so the record is clear, there is a standing objection insofar as each time she either testifies to a frequency or testifies to population frequency ranges.
Neufeld preserves appellate record with a blanket standing objection rather than requiring repeated interruptions.
George Clarke
She is the supervisor of the reporting of frequency data and described the fact how the methods in place in the lab had been reviewed extensively by more than one population geneticist, including one on board who has verified that the methods that she are responsible for in the lab are appropriate.
Prosecution argues Cotton's methods are validated by actual population geneticists, sidestepping whether Cotton herself qualifies as one.

Notable Exchanges (2)

Peter NeufeldGeorge Clarke
Clarke argued the objection had already been overruled two days prior; Neufeld maintained that testifying to a range of world population frequencies is a distinct and higher bar than the already-litigated statistical inference testimony.
strategic
Lance A. ItoPeter Neufeld
After overruling, Ito confirmed the ruling extends to all of Cotton's frequency range calculations, and Neufeld accepted the standing objection formulation.
procedural

Credibility Attacks (1)

⚔ Robin Cotton
qualification challenge
Neufeld argued Cotton lacks the credentials of a population geneticist or biostatistician needed to opine on world population frequency ranges and substructure — a foundational attack aimed at limiting the weight of DNA frequency evidence.

Objections

1 objections (0 sustained, 1 overruled)
Proceeding 6027 • 15 utterances
Criminal Trial
Department 103
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📂 MAY 11, 1995 📄 Sidebar: population frequency
MAY 11, 1995 KRT DvH TD