diff --git a/scripts/audit/anomalies.py b/scripts/audit/anomalies.py
index c856a5d17..762fc30a5 100644
--- a/scripts/audit/anomalies.py
+++ b/scripts/audit/anomalies.py
@@ -189,6 +189,11 @@ def _effective_lodged_divergence(a: PropertyAudit) -> Optional[str]:
     return f"effective {a.effective_sap:.0f} vs lodged {a.lodged_sap:.0f} (Δ{gap:+.0f}, reason={a.rebaseline_reason})"
 
 
+@check("implausible-lodged-score", Severity.LOW)
+def _implausible_lodged_score(a: PropertyAudit) -> Optional[str]:
+    raise NotImplementedError
+
+
 @check("impossible-sap-over-100", Severity.HIGH)
 def _impossible_sap_over_100(a: PropertyAudit) -> Optional[str]:
     """A SAP score above 100 is impossible (SAP caps at 100) — a calculator /
diff --git a/tests/scripts/test_audit_anomalies.py b/tests/scripts/test_audit_anomalies.py
index b6acf3fde..69cd25080 100644
--- a/tests/scripts/test_audit_anomalies.py
+++ b/tests/scripts/test_audit_anomalies.py
@@ -5,6 +5,7 @@ import pytest
 from scripts.audit.anomalies import (
     PropertyAudit,
     _effective_lodged_divergence,
+    _implausible_lodged_score,
 )
 
 
@@ -46,3 +47,28 @@ class TestEffectiveLodgedDivergence:
 
         # Assert
         assert result is None
+
+    def test_fires_when_lodged_sap_at_or_above_floor_with_large_gap(self) -> None:
+        # Arrange — lodged=20 (band G, plausible), effective=65 (band D), gap +45
+        audit = _make_audit(lodged_sap=20.0, effective_sap=65.0)
+
+        # Act
+        result = _effective_lodged_divergence(audit)
+
+        # Assert
+        assert result is not None
+        assert "65" in result
+        assert "20" in result
+
+
+class TestImplausibleLodgedScore:
+    def test_fires_when_lodged_sap_below_floor_and_gap_large(self) -> None:
+        # Arrange — Class C exemplar: lodged=1, effective=76 (gap +75)
+        audit = _make_audit(lodged_sap=1.0, effective_sap=76.0)
+
+        # Act
+        result = _implausible_lodged_score(audit)
+
+        # Assert
+        assert result is not None
+        assert "1" in result