This paper canvasses some of the limitations and possible negative consequences of globalization of criminal procedure. The references to specific examples in this paper assume generally the framework of the legal systems of the European Union and its member states. This, however, is done with the idea in mind that at least some of the remarks made here could be also relevant in a wider international context, when other legal systems are taken into consideration. In the paper, particular attention is paid to possible negative consequences of globalization tendencies. Assuming this perspective was intentional, in order to draw the reader’s attention, references are made to those issues which are especially important from the point of view of legal certainty of an individual but seem to attract less attention in the literature on the subject than general analyses of the phenomenon of synergy of legal systems and the benefits stemming therefrom.