The expertise is always ordered when the perception or appreciation of the facts requires special technical, scientific or artistic knowledge.
Psychiatric medical examination is subject to the same general rules as all specialist examinations and is carried out by forensic establishments and forensic surgeries, by medical practitioners employed under contract to provide expert opinions.
In cases where there is no consent to the person to be examined, the competent judicial Authority can authorize the measure.
Performing a psychiatric medical examination of victim/witness obeys the same general rules.