diff --git a/scripts/benchmark_nuke3_compare.py b/scripts/benchmark_nuke3_compare.py
index 18fb853..dc3509a 100644
--- a/scripts/benchmark_nuke3_compare.py
+++ b/scripts/benchmark_nuke3_compare.py
@@ -560,21 +560,37 @@ def _rebuild_and_select(data: dict) -> dict:
     }
 
     selection = select_dp(dossier, synthese, config={"llm_enabled": False})
+    dossier.dp_selection = selection
+
+    # Finalizer DP (arbitrage Trackare vs CRH, traçabilité)
+    try:
+        from src.medical.dp_finalizer import finalize_dp
+        finalize_dp(dossier)
+    except Exception:
+        pass
+
+    # Utiliser dp_final si disponible, sinon dp_selection
+    final = dossier.dp_final or selection
 
     # Convertir en dict compatible analyze_dp_selection
-    cands = [c.model_dump() for c in selection.candidates]
-    return {
+    cands = [c.model_dump() for c in final.candidates]
+    result = {
         "dp_selection": {
-            "verdict": selection.verdict,
-            "confidence": selection.confidence,
-            "chosen_code": selection.chosen_code,
-            "chosen_term": selection.chosen_term,
+            "verdict": final.verdict,
+            "confidence": final.confidence,
+            "chosen_code": final.chosen_code,
+            "chosen_term": final.chosen_term,
             "candidates": cands,
-            "evidence": selection.evidence,
-            "reason": selection.reason,
-            "debug_scores": selection.debug_scores,
+            "evidence": final.evidence,
+            "reason": final.reason,
+            "debug_scores": final.debug_scores,
         }
     }
+    if dossier.dp_final:
+        result["dp_final"] = dossier.dp_final.model_dump(exclude_none=True)
+    if dossier.quality_flags:
+        result["quality_flags"] = dossier.quality_flags
+    return result
 
 
 def _run_debug_reports(
diff --git a/src/config.py b/src/config.py
index 48dc712..711ec24 100644
--- a/src/config.py
+++ b/src/config.py
@@ -68,6 +68,52 @@ def get_model(role: str) -> str:
     return OLLAMA_MODELS.get(role, OLLAMA_MODEL)
 
 
+# --- Flag LLM pour le sélecteur DP (NUKE-3) ---
+# Nom canonique : T2A_DP_RANKER_LLM (0/1)
+# Ancien nom accepté (compat) : DP_RANKER_LLM_ENABLED
+DP_RANKER_LLM_ENABLED = os.environ.get("T2A_DP_RANKER_LLM", "1").lower() in ("1", "true", "yes")
+
+
+def get_dp_ranker_llm_enabled() -> bool:
+    """Retourne l'état du flag LLM pour NUKE-3 (lecture fraîche de l'env).
+
+    Nom canonique : T2A_DP_RANKER_LLM (0/1/true/false/yes/no).
+    Accepte aussi l'ancien nom DP_RANKER_LLM_ENABLED avec warning.
+    """
+    canonical = os.environ.get("T2A_DP_RANKER_LLM")
+    legacy = os.environ.get("DP_RANKER_LLM_ENABLED")
+
+    if canonical is not None:
+        return canonical.lower() in ("1", "true", "yes")
+
+    if legacy is not None:
+        import logging as _logging
+        _logging.getLogger(__name__).warning(
+            "Env var DP_RANKER_LLM_ENABLED est dépréciée — utiliser T2A_DP_RANKER_LLM"
+        )
+        return legacy.lower() in ("1", "true", "yes")
+
+    # Défaut : activé
+    return True
+
+
+def check_adversarial_model_config() -> tuple[bool, str]:
+    """LOGIC-3 — Vérifie si les modèles CPAM et validation sont identiques.
+
+    Returns:
+        (same_model, warning_message)
+    """
+    cpam = OLLAMA_MODELS.get("cpam", "")
+    validation = OLLAMA_MODELS.get("validation", "")
+    if cpam and validation and cpam == validation:
+        msg = (
+            f"Modèles CPAM et validation identiques ({cpam}) "
+            "— validation adversariale dégradée"
+        )
+        return True, msg
+    return False, ""
+
+
 # --- Configuration RUM / établissement ---
 
 FINESS = os.environ.get("T2A_FINESS", "000000000")
@@ -553,6 +599,37 @@ class CodeDecision(BaseModel):
     applied_rules: list[str] = Field(default_factory=list)
 
 
+class DPCandidate(BaseModel):
+    """Candidat DP pour la sélection NUKE-3."""
+
+    index: int
+    term: str
+    code: Optional[str] = None
+    confidence: Optional[str] = None
+    source: Optional[str] = None
+    is_comorbidity_like: bool = False
+    is_symptom_like: bool = False
+    is_act_only: bool = False
+    section_strength: int = 0
+    num_occurrences: int = 1
+    score: float = 0.0
+    score_details: dict = Field(default_factory=dict)
+
+
+class DPSelection(BaseModel):
+    """Résultat de la sélection NUKE-3 du DP."""
+
+    chosen_index: Optional[int] = None
+    chosen_term: Optional[str] = None
+    chosen_code: Optional[str] = None
+    confidence: Optional[str] = None
+    verdict: str = "REVIEW"  # CONFIRMED | REVIEW
+    evidence: list[str] = Field(default_factory=list)
+    reason: Optional[str] = None
+    candidates: list[DPCandidate] = Field(default_factory=list)
+    debug_scores: Optional[dict] = None
+
+
 class Diagnostic(BaseModel):
     texte: str
     cim10_suggestion: Optional[str] = None
@@ -656,6 +733,12 @@ class DossierMedical(BaseModel):
     document_type: str = ""
     sejour: Sejour = Field(default_factory=Sejour)
     diagnostic_principal: Optional[Diagnostic] = None
+    dp_selection: Optional[DPSelection] = None
+    # Traçabilité DP (finalizer) — audit DIM
+    dp_trackare: Optional[DPSelection] = None   # DP issu du Trackare (si existant)
+    dp_crh_only: Optional[DPSelection] = None   # DP issu du CRH-only pipeline
+    dp_final: Optional[DPSelection] = None       # DP final après arbitrage finalizer
+    quality_flags: dict = Field(default_factory=dict)
     diagnostics_associes: list[Diagnostic] = Field(default_factory=list)
     actes_ccam: list[ActeCCAM] = Field(default_factory=list)
     antecedents: list[Antecedent] = Field(default_factory=list)
diff --git a/src/main.py b/src/main.py
index cb66880..bf7b830 100644
--- a/src/main.py
+++ b/src/main.py
@@ -262,6 +262,13 @@ def process_pdf(pdf_path: Path) -> list[tuple[str, DossierMedical, Anonymization
         except Exception:
             logger.warning("  Erreur estimation GHM/metrics", exc_info=True)
 
+        # 10. Finalizer DP (arbitrage Trackare vs CRH, traçabilité)
+        try:
+            from .medical.dp_finalizer import finalize_dp
+            finalize_dp(dossier)
+        except Exception:
+            logger.warning("  Finalizer DP : erreur", exc_info=True)
+
         dossier.processing_time_s = round(time.time() - t0, 2)
         results.append((anonymized_text, dossier, report))
 
@@ -629,6 +636,13 @@ def main(input_path: str | None = None) -> None:
                 except Exception:
                     logger.warning("  Erreur estimation GHM/metrics final", exc_info=True)
 
+                # Finalizer DP (arbitrage Trackare vs CRH, traçabilité)
+                try:
+                    from .medical.dp_finalizer import finalize_dp
+                    finalize_dp(merged)
+                except Exception:
+                    logger.warning("  Finalizer DP fusionné : erreur", exc_info=True)
+
                 struct_dir = STRUCTURED_DIR / subdir
                 struct_dir.mkdir(parents=True, exist_ok=True)
                 merged_path = struct_dir / f"{subdir}_fusionne_cim10.json"
diff --git a/src/medical/dp_finalizer.py b/src/medical/dp_finalizer.py
new file mode 100644
index 0000000..13a46ab
--- /dev/null
+++ b/src/medical/dp_finalizer.py
@@ -0,0 +1,335 @@
+"""DP Finalizer — arbitrage Trackare vs CRH-only.
+
+Dernière étape du pipeline DP : produit ``dp_final`` avec traçabilité
+complète (``dp_trackare``, ``dp_crh_only``) et ``quality_flags`` audit.
+
+Principes :
+- Clean architecture : logique métier isolée, pas de dépendance Ollama.
+- Traçabilité : chaque décision est justifiée (reason + evidence + flags).
+- Prudence : en cas de doute → REVIEW, jamais CONFIRMED.
+"""
+
+from __future__ import annotations
+
+from src.config import DossierMedical, DPSelection
+
+# Whitelist Z-codes admis en DP CONFIRMED (même que dp_selector)
+_Z_CODE_DP_WHITELIST = frozenset({
+    "Z03", "Z04", "Z08", "Z09",
+    "Z38", "Z43", "Z45", "Z50", "Z51", "Z54", "Z75",
+    "Z99",
+})
+
+
+def _family3(code: str | None) -> str:
+    """Extrait le préfixe 3 caractères (family3) d'un code CIM-10."""
+    if not code:
+        return ""
+    return code.split(".")[0].upper()
+
+
+def _code_in_candidates(code: str | None, selection: DPSelection) -> bool:
+    """Vérifie si *code* apparaît dans les candidats de *selection* (exact ou family3)."""
+    if not code or not selection.candidates:
+        return False
+    code_up = code.upper()
+    fam = _family3(code)
+    for c in selection.candidates:
+        c_code = (c.code or "").upper()
+        if c_code == code_up or _family3(c_code) == fam:
+            return True
+    return False
+
+
+def _has_strong_evidence(sel: DPSelection) -> bool:
+    """Vérifie si la sélection a une evidence forte (non triviale)."""
+    if not sel.evidence:
+        return False
+    # "Source: Trackare" seul n'est pas une preuve forte
+    strong = [e for e in sel.evidence if "Trackare" not in e]
+    return len(strong) > 0
+
+
+def _make_selection(
+    code: str | None,
+    term: str | None,
+    verdict: str,
+    confidence: str,
+    evidence: list[str],
+    reason: str,
+    source_sel: DPSelection | None = None,
+) -> DPSelection:
+    """Construit un DPSelection final en préservant les candidats de la source."""
+    return DPSelection(
+        chosen_code=code,
+        chosen_term=term,
+        verdict=verdict,
+        confidence=confidence,
+        evidence=evidence,
+        reason=reason,
+        candidates=source_sel.candidates if source_sel else [],
+        debug_scores=source_sel.debug_scores if source_sel else None,
+        chosen_index=source_sel.chosen_index if source_sel else None,
+    )
+
+
+# ── Règles R1-R5 ──────────────────────────────────────────────────────
+
+
+def decide_dp_final(
+    trackare_dp: DPSelection | None,
+    crh_dp: DPSelection | None,
+    allow_symptom_dp: bool = False,
+) -> tuple[DPSelection, dict, list[str]]:
+    """Arbitrage Trackare vs CRH-only.
+
+    Returns:
+        (dp_final, quality_flags_additions, alertes)
+    """
+    flags: dict = {}
+    alertes: list[str] = []
+
+    # ── Cas dégénérés ──────────────────────────────────────────────
+
+    if not trackare_dp and not crh_dp:
+        return (
+            DPSelection(verdict="REVIEW", reason="Aucun DP disponible"),
+            {"no_dp_source": True},
+            ["Aucun DP extrait (ni Trackare ni CRH)"],
+        )
+
+    if not trackare_dp and crh_dp:
+        # CRH-only mode — pass-through
+        dp = crh_dp.model_copy(deep=True)
+        flags["crh_only_mode"] = True
+        # Appliquer R5 post-hoc
+        dp, r5_flags, r5_alertes = _apply_r5(dp, crh_dp, allow_symptom_dp)
+        flags.update(r5_flags)
+        alertes.extend(r5_alertes)
+        return dp, flags, alertes
+
+    if trackare_dp and not crh_dp:
+        # Trackare-only mode
+        code = trackare_dp.chosen_code or ""
+        # R5 : Z-code → REVIEW
+        if code.startswith("Z") and _family3(code) not in _Z_CODE_DP_WHITELIST:
+            dp = _make_selection(
+                code=trackare_dp.chosen_code,
+                term=trackare_dp.chosen_term,
+                verdict="REVIEW",
+                confidence="medium",
+                evidence=trackare_dp.evidence + ["Z-code en DP : vérification DIM requise"],
+                reason="R5 — Z-code non whitelisté en DP",
+                source_sel=trackare_dp,
+            )
+            flags["trackare_only_mode"] = True
+            flags["z_code_dp_review"] = True
+            return dp, flags, ["DP Trackare Z-code non whitelisté → REVIEW"]
+
+        dp = trackare_dp.model_copy(deep=True)
+        # Respecter un REVIEW déjà posé par le garde-fou dp_selector
+        if not dp.evidence:
+            dp.evidence = ["Source: Trackare (codage établissement)"]
+        flags["trackare_only_mode"] = True
+        return dp, flags, alertes
+
+    # ── Les deux sources existent ──────────────────────────────────
+    assert trackare_dp is not None and crh_dp is not None
+
+    t_code = (trackare_dp.chosen_code or "").upper()
+    c_code = (crh_dp.chosen_code or "").upper()
+    t_fam = _family3(t_code)
+    c_fam = _family3(c_code)
+
+    # ── R3 — Trackare symptôme (R*) + CRH étiologique ─────────────
+    # (évalué avant R1 : cas spécifique > cas général)
+    if t_code.startswith("R"):
+        if crh_dp.verdict == "CONFIRMED" and not c_code.startswith("R") and _has_strong_evidence(crh_dp):
+            # Override : CRH étiologique CONFIRMED
+            dp = crh_dp.model_copy(deep=True)
+            dp.reason = "R3 — Trackare symptôme écarté au profit du CRH étiologique CONFIRMED"
+            flags["trackare_symptom_overridden"] = True
+            alertes.append(
+                f"Trackare symptôme ({t_code}) remplacé par CRH ({c_code}) — "
+                f"diagnostic étiologique CONFIRMED"
+            )
+            # R5 post-hoc
+            dp, r5_flags, r5_alertes = _apply_r5(dp, crh_dp, allow_symptom_dp)
+            flags.update(r5_flags)
+            alertes.extend(r5_alertes)
+            return dp, flags, alertes
+        else:
+            # REVIEW prudent
+            dp = _make_selection(
+                code=trackare_dp.chosen_code,
+                term=trackare_dp.chosen_term,
+                verdict="REVIEW",
+                confidence="medium",
+                evidence=[
+                    "Source: Trackare (codage établissement)",
+                    "Alerte: Trackare code un symptôme (R*) mais le CRH mentionne un diagnostic étiologique",
+                ],
+                reason="R3 — Trackare symptôme vs CRH diagnostic : vérification DIM requise",
+                source_sel=trackare_dp,
+            )
+            flags["trackare_symptom_vs_crh_diagnosis"] = True
+            alertes.append(
+                f"Trackare symptôme ({t_code}) vs CRH ({c_code}) — vérification DIM requise"
+            )
+            return dp, flags, alertes
+
+    # ── R1 — CRH CONFIRMED avec evidence forte → CRH prime ────────
+    if crh_dp.verdict == "CONFIRMED" and _has_strong_evidence(crh_dp):
+        dp = crh_dp.model_copy(deep=True)
+        dp.reason = "R1 — CRH-only CONFIRMED avec preuves fortes"
+        if t_code and t_code != c_code and t_fam != c_fam:
+            flags["override_trackare_by_crh_confirmed"] = True
+            alertes.append(
+                f"DP final basé CRH-only CONFIRMED ({c_code}) — "
+                f"Trackare ({t_code}) écarté (preuves CRH supérieures)"
+            )
+        else:
+            flags["crh_confirmed_coherent"] = True
+        # R5 post-hoc
+        dp, r5_flags, r5_alertes = _apply_r5(dp, crh_dp, allow_symptom_dp)
+        flags.update(r5_flags)
+        alertes.extend(r5_alertes)
+        return dp, flags, alertes
+
+    # ── R2 — Trackare non-symptôme, cohérent CRH → confirmer ──────
+    if (
+        not t_code.startswith("R")
+        and not t_code.startswith("Z")
+        and (t_code == c_code or t_fam == c_fam or _code_in_candidates(t_code, crh_dp))
+    ):
+        dp = _make_selection(
+            code=trackare_dp.chosen_code,
+            term=trackare_dp.chosen_term,
+            verdict="CONFIRMED",
+            confidence="high",
+            evidence=[
+                "Source: Trackare (codage établissement)",
+                f"Trackare {t_code} corroboré par CRH (candidat {c_code})",
+            ],
+            reason="R2 — Trackare non-symptôme corroboré par CRH",
+            source_sel=crh_dp,
+        )
+        flags["trackare_confirmed_by_crh"] = True
+        return dp, flags, alertes
+
+    # ── R4 — Ambigu / preuves faibles → REVIEW ────────────────────
+    if trackare_dp:
+        base = trackare_dp
+        base_label = "Trackare"
+    else:
+        base = crh_dp
+        base_label = "CRH"
+    dp = _make_selection(
+        code=base.chosen_code,
+        term=base.chosen_term,
+        verdict="REVIEW",
+        confidence="medium",
+        evidence=base.evidence[:2] + ["Preuves insuffisantes pour confirmation automatique"],
+        reason="R4 — Ambigu / preuves faibles",
+        source_sel=crh_dp,
+    )
+    flags["review_ambiguous"] = True
+    alertes.append(f"DP ambigu ({base_label} {base.chosen_code or '?'}) — REVIEW")
+    return dp, flags, alertes
+
+
+# ── R5 — Interdits auto-confirm (post-hoc) ────────────────────────
+
+
+def _apply_r5(
+    dp: DPSelection,
+    crh_dp: DPSelection | None,
+    allow_symptom_dp: bool,
+) -> tuple[DPSelection, dict, list[str]]:
+    """Applique R5 : Z-code et R-code jamais auto-CONFIRMED (sauf whitelist)."""
+    flags: dict = {}
+    alertes: list[str] = []
+    code = (dp.chosen_code or "").upper()
+
+    # Z-code non whitelisté → forcer REVIEW
+    if code.startswith("Z") and _family3(code) not in _Z_CODE_DP_WHITELIST:
+        if dp.verdict == "CONFIRMED":
+            dp.verdict = "REVIEW"
+            dp.confidence = "medium"
+            dp.evidence.append("R5 — Z-code non whitelisté en DP → REVIEW")
+            dp.reason = (dp.reason or "") + " | R5 Z-code"
+            flags["z_code_dp_review"] = True
+            alertes.append(f"Z-code {code} en DP → REVIEW (R5)")
+
+    # R-code avec candidat non-R disponible → REVIEW si allow_symptom_dp=false
+    if (
+        code.startswith("R")
+        and not allow_symptom_dp
+        and crh_dp
+        and any(
+            not (c.code or "").upper().startswith("R")
+            for c in crh_dp.candidates
+            if c.code
+        )
+    ):
+        if dp.verdict == "CONFIRMED":
+            dp.verdict = "REVIEW"
+            dp.confidence = "medium"
+            dp.evidence.append("R5 — Symptôme R-code en DP avec candidat non-R disponible → REVIEW")
+            dp.reason = (dp.reason or "") + " | R5 R-code"
+            flags["r_code_dp_with_non_r_candidate"] = True
+            alertes.append(f"R-code {code} en DP avec alternative non-R → REVIEW (R5)")
+
+    return dp, flags, alertes
+
+
+# ── Fonction publique ──────────────────────────────────────────────
+
+
+def finalize_dp(dossier: DossierMedical) -> DossierMedical:
+    """Point d'entrée unique du finalizer.
+
+    Lit ``dp_selection`` et ``document_type``, produit :
+    - ``dp_trackare`` (si Trackare)
+    - ``dp_crh_only`` (si CRH)
+    - ``dp_final`` (arbitrage)
+    - ``quality_flags`` (merge sans écraser)
+    - ``alertes_codage`` (append)
+    """
+    # ── 1. Identifier les sources DP ───────────────────────────────
+    trackare_dp: DPSelection | None = None
+    crh_dp: DPSelection | None = None
+
+    if dossier.dp_selection:
+        sel = dossier.dp_selection
+        reason = (sel.reason or "").lower()
+        is_trackare_source = (
+            dossier.document_type == "trackare"
+            or "trackare" in reason
+            or any("Trackare" in e for e in sel.evidence)
+        )
+        if is_trackare_source:
+            trackare_dp = sel
+        else:
+            crh_dp = sel
+
+    # ── 2. Stocker les sources pour traçabilité ────────────────────
+    dossier.dp_trackare = trackare_dp
+    dossier.dp_crh_only = crh_dp
+
+    # ── 3. Arbitrage ───────────────────────────────────────────────
+    dp_final, flags, alertes = decide_dp_final(trackare_dp, crh_dp)
+
+    # ── 4. Écrire les résultats ────────────────────────────────────
+    dossier.dp_final = dp_final
+
+    # Merge quality_flags (ne pas écraser les flags existants)
+    for k, v in flags.items():
+        dossier.quality_flags[k] = v
+
+    # Append alertes_codage
+    for alerte in alertes:
+        if alerte not in dossier.alertes_codage:
+            dossier.alertes_codage.append(alerte)
+
+    return dossier