BULGARIA - PENAL PROCEDURE CODE
Part two. EVIDENCING
Chapter thirty six. PROCEDURES IN CONNECTION WITH INTERNATIONAL COOPERATION ON PENAL CASES
Section III. International Legal Assistance in Penal Cases
Art. 471. (1) International legal assistance in penal cases of another state shall be rendered on the terms of a concluded international treaty to which the Republic of Bulgaria is a party, or on the principle of mutuality. International legal assistance in penal cases shall also be rendered to an international court of justice whose jurisdiction has been recognised by the Republic of Bulgaria.
(2) The international legal assistance shall include:
...
2. investigation actions
Identification and whereabouts of persons - national procedures for ICC proceedings
Location of items - national procedures for ICC proceedings
Taking of evidence - national procedures for ICC proceedings
Production of evidence - national procedures for ICC proceedings
Questioning of persons - national procedures for ICC proceedings
Examination of witnesses - national procedures for ICC proceedings
Examination of places or sites - national procedures for ICC proceedings
EDIT.