Science in the Courtroom
Judge Paul Chernoff
The O.J. Simpson trial brought home to millions around the world the degree to
which DNA fingerprinting and other laboratory sciences have begun to influence
decision-making in the courtroom. In some cases, DNA tests have even led to the
release of death-row prisoners whom the tests have exonerated. Here Judge Paul
Chernoff of the Norfolk Superior Court in Massachusetts, who organized and
attended a recent seminar on DNA given for Massachusetts Superior Court judges
at Boston's Whitehead Institute for Biomedical Research, describes the
experience and why he feels it is vital that judges be schooled in these novel
NOVA: Have you had to rule on any cases involving DNA analysis such as that
performed in the Sheppard murder case?
Chernoff: Only in blood and semen matching on a couple of serious sexual
assault matters. In one case, it actually ended up exculpating the individual.
A woman who was sight-impaired identified her attacker by his voice, and then
the DNA testing of his blood versus the semen or sperm found in the woman
excluded him absolutely and positively, and he was acquitted. And, you know,
that's what Attorney General Janet Reno is concerned about. She thinks the real
potential for DNA is to free the innocent, and not to necessarily inculpate the
perpetrators, although it certainly works to that effect, too.
NOVA: Why is it important that judges be up on DNA analysis in forensics?
Chernoff: Well, I think there are at least four reasons why we should be,
because the subject can visit us in at least four ways, probably even more. The
first way is that, in ruling on admissibility of evidence on a case-by-case
basis, this technique comes across our benches now and will continue to do so.
It's especially important in criminal cases, because it can exclude or
inculpate an alleged perpetrator.
The second way is that DNA is such a powerful tool for potentially
understanding human behavior, and we're certainly going to see it on that
plane. Last week during a case's sentencing, for instance, it was brought to my
attention that the defendant had a certain genetic abnormality, which I was
asked to consider in the sentencing decision.
The third area deals with the right of privacy, and already we've experienced
that. The very taking of samples, the access of individuals to a database, the
use and misuse of the data—all this goes far beyond what fingerprints and
hair samples can reveal.
regularly hire specialists to test blood from crime scenes, such as this
photographed in the Sheppard home, which brings up privacy issues unknown in
The last area is perhaps the most important. It hasn't come to us yet, though
we've seen that people in other facets of government, meaning the legislative
and executive branches, are often concerned about the potential of this very,
very powerful science and whether or not government should regulate it in any
way. As the potential for what can be done with this becomes more and more
known, I think we judges are going to find ourselves as referees between
government and science.
NOVA: Should judges have an in-depth understanding of such scientific
techniques, or would a basic understanding suffice?
Chernoff: I think a basic knowledge would suffice. We in the Superior Court,
and I think most judges in courts of general jurisdiction, are generalists, and
we're expected to be quick learners, whether the subject matter is science or
sports or industry. We should be able to learn it rather quickly.
NOVA: So what was it like getting a lesson in DNA analysis?
Chernoff: For me, and I think I speak for all of my colleagues, it was really a
happening. We had hands-on laboratory experience. In judicial education, we're
subjected to a traditionally academic environment, and there's very little
chance for hands-on education. Another thing was a little surprising to me. We
were forewarned at the beginning that many of us would find it to be an
"existential moment" when we completed the laboratory steps and found ourselves
face-to-face with actual DNA. And you know, it was. I among others just looked
at this gelatinous stuff and said, "My God, that's DNA."
NOVA: Did you find the science daunting, or did it all make sense?
The use of results from DNA studies on the blood of both
victims and attackers alike has become commonplace in modern courtrooms.
Chernoff: Well, it was both daunting and approachable. Whether or not it made
sense, I'll reserve for another day, but the very basics and the overviews
certainly made sense to us. We learned that we're trainable, and that with
future programs we could come a long way on this. When you think about it, the
amount of progress that a group of 25 of us made in just two days under the
guidance of a handful of talented young scientists was impressive. I was pretty
pleased with how it went, and so was everyone else. We were struck with how
young these scientists appear; they were all 25 to 30 years old.
NOVA: What do you think is the biggest challenge that science and law will have
to face together with DNA?
Chernoff: Coping with the specter of an almost infinite amount of information.
I don't think we can imagine how much data will be developed and need to be
stored and dealt with over time. I don't even know if we've got the mechanism
for storing it, and I don't know what the security concerns are, but it's
certainly not like having 10,000 fingerprint cards in a file. It's information
that will fill up any computer resource and then some. It's going to be more
information than we can handle. That's a real problem that science and the
courts have to deal with.
Also, I'm not sure who should have access to that information. There will be
some very disturbing information about a lot of people, which maybe no one
should have a right to have. A number of jurisdictions have programs like we
have in Massachusetts, in which offenders in certain categories have to give
samples for DNA. That information then gets typed and stored. Most
jurisdictions don't have the capacity for storing and classifying that
information. And that's just the tip of what's going to be a very, very big
Another interesting thing about the potential of DNA and the potential of
storing all of this information is that when people plead guilty now, we tell
them that the government has the right to take a sample of their DNA, and that
data will then be stored and used for government purposes. It's like a super
Continue: If DNA fingerprinting is so seemingly perfect, are you taking the human
element out of it?
Chronology of a Murder |
Science in the Courtroom
Create a DNA Fingerprint |
3-D Mug Shot |
Cleared by DNA
Editor's Picks |
Previous Sites |
Join Us/E-mail |
About NOVA |
Site Map |
PBS Online |
NOVA Online |
© | Updated November 2000