Forensic identification of relatives of individuals included in a database of DNA profiles
Department of Statistics, University of Florence, 50134 Florence, Italy. cavallin{at}ds.unifi.it, corradi{at}ds.unifi.it
In this paper we evaluate the characteristics observed both on a crime sample and on individuals included in a database to assess the probability of alternative hypotheses concerning identification. The problem is first addressed by considering a generic characteristic and we demonstrate the problem via a computationally efficient Bayesian network. Then we turn our attention to a heritable DNA trait to show how to evaluate the hypotheses that some individuals, genetically related to the members of the database, are the donors of the crime sample. Then the network is extended to cope with many loci. Applications of the method are provided as well as details of computational requirements.
Key Words: Bayesian network; Database of DNA profiles; Forensic identification; Search on a database.
Received December 2004. Revised January 2006.