Seminar Details

Seminar Details


May 7

3:30 pm

The Forensic and Statistical Science of Evidence Derived from Fragments of Glass

Chris Triggs


University of Auckland - Department of Statistics

When someone breaks a window or another type of glass tiny fragments of glass are transferred onto their clothing. If the breaking of this window or other related events is a criminal offence, then these fragments become evidence. The physical properties of the recovered glass fragments can be matched with those of the putative source. However other processes are at work, which affect the quantity and strength of the evidence. It is important to understand both the transfer mechanism - how and how much of the glass gets on to the person, and the persistence mechanism - how much glass remains after a certain period of time. I will describe methods to model all of these processes and how the models can be used to give an overall evaluation of glass evidence.