45 organization administrated under the Ministry of Justice In the majority of cases documentation will be gathered as a step in the preliminary enquiries. In addition to the above it may be necessary to investigate the scene of the incident, obtain medical opinions, seize telephones or computers and gain access to logs for perusal of police registers. The Bureau is authorised to implement all legal means of investigation. The gathering of evidence in cases dealt with by the Bureau is accomplished first and foremost through interviewing the complainant, witnesses and the suspect. In some cases there are grounds for search, possibly seizure, arrest and detention in police custody. Act an investigation is mandatory in cases where a person has died or been seriously injured as a result of a police action or while in the custody of the police or the prosecuting authorities. or guidelines for the work of the investigative units.