diff --git a/policy_evaluation/tests/data/sample_logs.jsonl b/policy_evaluation/tests/data/sample_logs.jsonl
new file mode 100644
index 0000000..0186c29
--- /dev/null
+++ b/policy_evaluation/tests/data/sample_logs.jsonl
@@ -0,0 +1,30 @@
+{
+  "t_publish": 0.0, "t_gate_read": 0.1, "t_index_visible": 0.15, "pinned_flag": true, "timeouts": 0, "drift_signature": "normal"
+}
+{
+  "t_publish": 0.05, "t_gate_read": 0.25, "t_index_visible": 0.35, "pinned_flag": false, "timeouts": 1, "drift_signature": "minor"
+}
+{
+  "t_publish": 0.12, "t_gate_read": 0.28, "t_index_visible": 0.4, "pinned_flag": true, "timeouts": 0, "drift_signature": "normal"
+}
+{
+  "t_publish": 0.2, "t_gate_read": 0.5, "t_index_visible": 0.65, "pinned_flag": false, "timeouts": 2, "drift_signature": "drift_high"
+}
+{
+  "t_publish": 0.3, "t_gate_read": 0.55, "t_index_visible": 0.75, "pinned_flag": true, "timeouts": 0, "drift_signature": "normal"
+}
+{
+  "t_publish": 0.38, "t_gate_read": 0.6, "t_index_visible": 0.85, "pinned_flag": false, "timeouts": 1, "drift_signature": "minor"
+}
+{
+  "t_publish": 0.45, "t_gate_read": 0.7, "t_index_visible": 0.9, "pinned_flag": true, "timeouts": 0, "drift_signature": "normal"
+}
+{
+  "t_publish": 0.52, "t_gate_read": 0.75, "t_index_visible": 0.95, "pinned_flag": false, "timeouts": 3, "drift_signature": "drift_extreme"
+}
+{
+  "t_publish": 0.65, "t_gate_read": 0.8, "t_index_visible": 1.0, "pinned_flag": true, "timeouts": 0, "drift_signature": "normal"
+}
+{
+  "t_publish": 0.72, "t_gate_read": 0.9, "t_index_visible": 1.05, "pinned_flag": false, "timeouts": 0, "drift_signature": "normal"
+}
\ No newline at end of file