EN
The significance of the ne bis in idem principle is determined by its essence. In view of enhanced international cooperation this principle acquires a new meaning and the scope of its validity becomes redefined. EU Court of Justice referred to the ne bis principle – inter alia – on Zoran Spasic case. The author of this paper presents the most unconventional aspects of that important judgment. The Court found that reasons of safety and widely understood efficiency of functioning of cross-border prosecutions is more vital than understanding of the res judicata principle established in the literature.