Often unusual court cases raise important challenges for psychology and,
indirectly, for the ways in which psychologists may help police
investigations. This overlap -between the evidence a psychological expert
may offer in court and the guidance that may be given to a police
investigation – is brought into particularly sharp focus in those rare cases
when behavioural and psychological issues are at the heart of determining
guilt or innocence. Usually court cases revolve around matters of fact,
material evidence, or even circumstantial evidence such as who could
have been where when. But sometimes the facts of the case are so
indeterminate that it is the character of both the victim and the defendant
that are the central issue. If psychology has anything to offer the legal
process, surely it must at least be able to comment on such matters?