A voice is much more than just a string of words. Voices, unlike fingerprints,
are inherently complex. They signal a great deal of information in addition to
the intended message: the speakers' sex, for example, or their emotional state,
or age. Although evidence from DNA analysis grabs the headlines, DNA can't talk.
It can't be recorded planning, carrying-out or confessing to a crime. It can't
be so apparently directly incriminating. Perhaps it is these features that
contribute to the interest and importance of Forensic Speaker Identification
(FSI)