The phrase “likelihood ratio” and the role of Bayes' theorem in
establishing a logical framework for forensic inference now appear so
widely in the forensic science literature that we do not consider it
necessary to explain the mathematical background. In the next
section, we give only a brief overview of the logical structure and we
urge any reader who is unfamiliar with its basis to refer to standard
texts — particularly Robertson and Vignaux [3], Aitken and Taroni [4]
and Aitken, Roberts and Jackson [5]. Whereas we have chosen to
address the readership of Science and Justice, papers dealing with the
same judgment have been submitted to legal journals by Redmayne
et al. [6] and by Robertson, Vignaux and Berger [7].