BULGARIA - PENAL PROCEDURE CODE
Part two. EVIDENCING
Chapter fourteen. METHODS OF EVIDENCING
Section II. Interrogation
Art. 141. (1) The bodies of the pre-trial procedure and the court shall interrogate the witness whose identity is kept in secret and shall all possible precautions for keeping secret his/her identity, including whereas interrogation of a witness is performed abroad the country via video-conference or telephone conference.
(2) Copies of the records of interrogation of the witness without his/her signature shall be submitted immediately to the accused and to his/her defender, and in the court procedure – to the parties, which shall have right to question the witness in written.
(3) Following the order of Para 1 and 2 , interrogation of officer under cover shall be performed, as well as of the persons to which a protection measure under Art. 6, Para 1, items 3, 4 and 5 under the Law of Protection of Persons Threatened in Connection with a Criminal Procedure is imposed.
Protection of safety of physical or psychological well-being of victims, witnesses and families
Procedure for witness testimony - national proceedings
EDIT.