Skip to content
Go back

Therese Graversen | A Statistical Sleuth in the UK Justice System

Therese Graversen

Posted on:November 8, 2022 at 04:30 PM

Based on a series of criminal cases in the UK, where Therese Graversen was involved as an expert witness, she explains why it can be extremely difficult to evaluate DNA evidence and what role a statistician has in the legal system.

DNA is generally perceived as highly conclusive evidence, but in practice it can be surprisingly hard to determine the origins of a DNA sample. One of the challenges arise from samples of DNA that consist of DNA from several people. Just as there are many ways of adding two numbers to sum to 10, there are often many ways of mixing DNA that would lead to the same composition of the mixed sample. So, if the only evidence from the crime scene is a mixed sample of DNA, it is not at all straightforward to determine who were present.

In her talk, Therese will illustrate some of the issues by a puzzle where the individual peoples’ DNA make up the pieces. Can you find a way to match people to the DNA sample from the crime scene?


16:30 Talk begins

17:15 Small Break

17:20 Discussion

18:30 End of Event