[Expert witness in cases of rape].

The decision to try a rape case in court may depend on the medico-legal evidence documented by a doctor. Generally, doctors have little knowledge of expectations and requirements in court regarding testimony and expert opinion. In 1990, the Norwegian Directorate of Health recommended that victims of rape and violence all over the country--independent of police notification--be offered a medical and a medico-legal examination and follow-up. The Oslo Emergency Hospital has practised this health service for six years. The article describes the Oslo routine as a basis for doctors with little or no knowledge of the subject. Rape trauma, a variant of post-traumatic stress disturbance, manifests over time as physical, psychological and social reactions which influence the patient's health. The doctor must therefore follow the patient over time in order to apply this diagnosis. Rape trauma may be unknown to the court; a reason why the doctor should inform the prosecutor if it is decided that the case is to be tried in court. In order to document rape trauma as evidence the doctor must be called as an expert medical witness and not as an ordinary witness.