53Therefore, as the Advocate General has observed at points 74 to 78 and 84 of his Opinion, a decision of the prosecuting authorities terminating criminal proceedings and closing the investigation procedure, such as the decision in issue in the main proceedings, cannot be held to have been given after a determination as to the merits of the case and, accordingly, cannot be characterised as a final decision for the purposes of Article 54 of the CISA when it is clear from the reasons actually stated in that decision that there was no detailed investigation, as otherwise the mutual trust between the Member States could be undermined. In that regard, the fact that neither the victim nor a potential witness was interviewed is an indication that no detailed investigation was undertaken in the case in the main proceedings.
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