The possibility for a transfer of proceedings from another state is regulated in Article 478 of the Bulgarian Criminal Procedure Code.
The request for a transfer of proceedings from another Member State shall be accepted by the body of the criminal proceedings when several of the following grounds are present:
1. the offence, for which the request is made, is a criminal offence under the Bulgarian law;
2. the perpetrator is criminally liable under the Bulgarian law;
3. the perpetrator has permanent residence on the territory of the Republic of Bulgaria;
4. the perpetrator is a citizen of the Republic of Bulgaria;
5. the criminal offence, for which the request is made, is not considered a political offence or related to a political offence or a military criminal offence;
6. the request does not aim at prosecuting or punishing the person on account of his/her race, religion, citizenship, ethnic belonging, sex, civil status or political convictions;
7. a criminal proceeding has started against the perpetrator in the Republic of Bulgaria for the same or another criminal offence;
8. the transfer of proceeding is in the interest of the establishment of the truth and the most important evidence is located on the territory of the Republic of Bulgaria;
9. the execution of the verdict, if any, will improve the possibilities of the sentenced person for socialisation;
10. the personal presence of the perpetrator can be ensured in the proceeding in the Republic of Bulgaria;
11. the verdict, if any, can be executed in the Republic of Bulgaria;
12. the request does not contradict to the international obligations of the Republic of Bulgaria;
13. the request is not in contradiction to the main principles of the Bulgarian criminal and criminal-procedure law.
Every procedural act performed by a body of the requesting state in accordance with its national legislation enjoys in the Republic of Bulgaria the same evidentiary force it would have enjoyed it if it had been made by a Bulgarian authority.