Surveillance according the Bulgarian legislation (Article 7 of Law on Special Intelligence Means), in this scope room surveillance, is a special investigative technique for gathering evidence in criminal case. This special intelligence mean - visual and by technical devices shall be used to detect, reveal and record the movements of monitored person.
The surveillance shall be performed by virtue of a decision of competent judicial authority (district court) and may be applied both during the pre-trial stage and during the court proceedings.
The issuing authority shall indicate in the European Investigative Order the reasons why the said authority considers that the indicated investigative measure and other procedural measures are relevant for the purpose of the criminal proceeding concerned.
The recognition and execution of a European Investigative Order may be refused, in addition to the grounds referred to in Article 16 of Law of EIO, also if the execution of the investigative measure concerned and other procedural measures is not authorised by Bulgarian legislation in a similar case.
The measure is applicable only to particular crimes under the Bulgarian Criminal Code envisaged under Article 172 of Criminal Procedure Code of the Republic of Bulgaria.
The EIO for application of the measure is usually confidential.