L’expertise psychiatrique pénale de responsabilité permet d’assurer un équilibre entre la psychiatrie et la justice. Aujourd’hui elle semble connaître un malaise, avec des critiques de plus en plus nombreuses portant particulièrement sur l’existence de divergences entre les experts, sans que des études spécifiques n’aient été menées pour le confirmer.

Notre objectif était de proposer une revue de la littérature sur ce sujet pour dégager les principaux points de divergences et proposer des pistes explicatives.

Pour cela, nous avons étudié le rapport de la commission d’audition de 2007 sur l’expertise psychiatrique pénale ainsi que les contributions des différents auteurs et avons réalisé une recherche bibliographique sur PubMed, Cairn et Science Direct.

Les divergences concernaient surtout l’interprétation médicolégale, la discussion de la relation entre la pathologie et l’infraction, plus particulièrement dans des contextes qui impliquent une discussion médicolégale plus poussée, notamment l’arrêt des traitements médicamenteux, la prise de toxiques ou encore la négation des faits par un accusé souffrant de troubles mentaux. Il existait également des divergences diagnostiques et des divergences liées au concept même d’altération du discernement.

Les désaccords semblaient liés avant tout à des conceptions personnelles ou à des courants de pensée différents qui influençaient l’interprétation et les conclusions des experts.

Forensic psychiatric assessment regarding liability ensures a balance between justice and psychiatry. In France, criminal assessment is not contradictory. The psychiatric expert is commissioned by judges to determine whether or not the accused has a mental disorder and specify whether it affects discernment and control of actions at the time of offense. Its mission focuses on the mental element required to constitute an offense, and is structured around Article 122-1 of the Criminal Code. This article, composed of two paragraphs, distinguishes the framework of the abolition of discernment – a cause of non-imputability and therefore of a statement of lack of criminal responsibility due to mental disorder – and the framework of the alteration of discernment. Nowadays expertise seems to meet discomfort, with criticism focusing on possible differences among psychiatric experts, without specific studies having been conducted to confirm it.

Our objective was to identify the main points of disagreement between psychiatric experts and to propose explicative hypotheses.

For this, we carried out a literature review on PubMed, Science Direct and Cairn, and studied the report of the 2007 public hearing on forensic psychiatric assessment with contributions from different authors. The keywords were: forensic psychiatry, psychiatric court report, psychiatric expertise, differences among experts, legal responsibility, and discernment. We defined differences as disagreements between experts, or as a mismatch in conclusions and approaches of experts.

The differences among experts concerned mainly forensic interpretation, i.e. the discussion of the relationship between pathology and offense, particularly in contexts that involve a larger forensic discussion, including interruption of medication, use of drugs, association with antisocial personality, premeditation, denial of facts, especially when the accused suffers from a mental illness (especially schizophrenia). For a finding of abolition of discernment, an expert must consider two requirements, one temporal (the mental disease must be active during offense) and the other causal that involves seeking a direct and exclusive relationship between the offence and the mental state, according to expert jurisprudence. Some experts do not comply with these two requirements or this jurisprudence, whence differences. There were also diagnostic differences and disputes relating to the concept of “alteration of discernment”. Disagreements appeared to be related primarily to personal ideologies or different schools of thought that influenced interpretations and conclusions of experts, e.g. accountability as a therapeutic response for the psychotic person. Then, the lack of clarity of expert mission regarding necessary causal relationship – between any disease and crime – to demonstrate to conclude an abolition of discernment, could also contribute to differences. Moreover, time available to achieve the mission is too short and the expert would not devote enough time to an expert examination, which could lead to less good expertise and differences; especially as observed clinical examination in expertise is sometimes difficult, misleading, due to pathological reticence of accused mentally ill but also sometimes due to possible simulations. Finally, the low quality of some expert reports – due in part to the less well-trained experts, but also the particular conditions of achievement of expertise, especially in prisons – were mentioned by some authors as causes of differences.

It appears from this review of literature that differences mainly concern forensic interpretation and are mainly explained by ideologies. This synthesis is a preliminary work prior to a study among psychiatric experts.