diff --git a/test/registered/bench_fn/test_bench_serving_functionality.py b/test/registered/bench_fn/test_bench_serving_functionality.py
index f573319c7..4eaa74a9c 100644
--- a/test/registered/bench_fn/test_bench_serving_functionality.py
+++ b/test/registered/bench_fn/test_bench_serving_functionality.py
@@ -74,9 +74,13 @@ class TestBenchServingFunctionality(CustomTestCase):
     def _verify_multi_turn_logs(self, content: str):
         reqs = []
         for line in content.splitlines():
-            if not line.startswith("{"):
+            idx = line.find("{")
+            if idx == -1:
+                continue
+            try:
+                obj = json.loads(line[idx:])
+            except json.JSONDecodeError:
                 continue
-            obj = json.loads(line)
             if obj.get("event") != "request.finished":
                 continue
             text = obj.get("obj", {}).get("text")
diff --git a/test/registered/utils/test_request_logger.py b/test/registered/utils/test_request_logger.py
index c87a88448..ae6c7e352 100644
--- a/test/registered/utils/test_request_logger.py
+++ b/test/registered/utils/test_request_logger.py
@@ -190,10 +190,11 @@ class TestRequestLoggerJson(BaseTestRequestLogger, CustomTestCase):
         received_found = False
         finished_found = False
         for line in content.splitlines():
-            if not line.strip() or not line.startswith("{"):
+            idx = line.find("{")
+            if idx == -1:
                 continue
             try:
-                data = json.loads(line)
+                data = json.loads(line[idx:])
             except json.JSONDecodeError:
                 continue
 
@@ -227,10 +228,11 @@ class TestRequestLoggerJson(BaseTestRequestLogger, CustomTestCase):
     def _verify_openai_logs(self, content: str, source_name: str):
         openai_received_found = False
         for line in content.splitlines():
-            if not line.strip() or not line.startswith("{"):
+            idx = line.find("{")
+            if idx == -1:
                 continue
             try:
-                data = json.loads(line)
+                data = json.loads(line[idx:])
             except json.JSONDecodeError:
                 continue
             if data.get("event") != "request.received.openai":
diff --git a/test/registered/utils/test_scheduler_status_logger.py b/test/registered/utils/test_scheduler_status_logger.py
index 2247afbd4..d579a77e8 100644
--- a/test/registered/utils/test_scheduler_status_logger.py
+++ b/test/registered/utils/test_scheduler_status_logger.py
@@ -64,10 +64,15 @@ class TestSchedulerStatusLogger(CustomTestCase):
 def _find_log_events(log_dir: str, event_name: str):
     for f in Path(log_dir).glob("*.log"):
         for line in f.read_text().splitlines():
-            if line.startswith("{"):
-                data = json.loads(line)
-                if data.get("event") == event_name:
-                    yield data
+            idx = line.find("{")
+            if idx == -1:
+                continue
+            try:
+                data = json.loads(line[idx:])
+            except json.JSONDecodeError:
+                continue
+            if data.get("event") == event_name:
+                yield data
 
 
 if __name__ == "__main__":