Accordingly, the main question posed in the paper is how and to what extent the sensitive issues of proportionality and fundamental rights protection that spring from EU measures implementing the mutual recognition principle in the field of criminal justice have been or could be balanced. It is argued that there is a need for methodological awareness, particularly as regards the proper way of balancing mutual recognition and fundamental rights. Accordingly, the paper considers whether and to what extent it might be beneficial to transplant in the Area of Freedom, Security and Justice the balancing method developed within the Internal Market, where the mutual recognition made its first appearance.