diff --git a/backend/pashub_fetcher/pashub_client.py b/backend/pashub_fetcher/pashub_client.py
index 30c1ee76..5fc32954 100644
--- a/backend/pashub_fetcher/pashub_client.py
+++ b/backend/pashub_fetcher/pashub_client.py
@@ -96,7 +96,7 @@ class PashubClient:
         self,
         files: List[EvidenceFileData],
     ) -> List[EvidenceFileData]:
-        raise NotImplementedError
+        return [f for f in files if get_core_file_type(f.file_name, f.evidence_category) is None]
 
     def _select_latest_core_files(
         self,