Evaluating innovative treatments in forensic mental health: A role for single case methodology?

Abstract

The rapid development of new forensic mental health services and treatments has created a demand for research and evidence relating to the effectiveness of interventions. Unfortunately, the literature on outcomes of treatments for mentally disordered offenders is sparse, compared with the substantial 'what works' literature regarding non-disordered offenders in the criminal justice system. In this paper we propose that single case research methodologies have a part to play in remedying this unsatisfactory state of affairs. The strengths and limitations of single case methods are discussed and comparisons made with RCTs, particularly in the context of dangerous and severe personality disorder (DSPD) services in England and Wales. Important strategic decisions that need to be made in relation to the implementation of single case experimental methods are outlined.