Part III
Transfer of criminal proceedings
CHAPTER I
Delegation of competence in criminal proceedings in favour of the Portuguese judicial authorities
Article 80
Specific requirements
1. Criminal proceedings may be taken or continued in Portugal for an act committed outside the Portuguese territory, subject to the general requirements provided for in this law, as well as the specific requirements that follow:
b) the foreign State must have provided guarantees that it shall not take proceedings against the person concerned, for the same facts, if a final judgement is rendered by a Portuguese court in respect of the same person and for the same facts;
Ne bis in idem - foreign court
EDIT.