diff --git a/roadscore/prototype/prepared_session.py b/roadscore/prototype/prepared_session.py
index 97a2882498..46d0dc0245 100644
--- a/roadscore/prototype/prepared_session.py
+++ b/roadscore/prototype/prepared_session.py
@@ -5,6 +5,7 @@ from pathlib import Path
 
 
 def verify(metadata,environ):
+ if metadata.get('resident_capable') and environ.get('ROADSCORE_RESIDENT')!='1':raise ValueError('Resident service requires an opted-in fresh handoff and playback lease')
  if int(metadata.get('generation_seed',-1))!=int(environ['ROADSCORE_GENERATION_SEED']):raise ValueError('Resident composer belongs to another seed; its owner must finish/release that session')
  if metadata.get('prepared_profile')!=environ.get('ROADSCORE_ACE_PROFILE','prism'):raise ValueError('Resident composer profile differs from this launch')
  if metadata.get('composition_policy','prepared-v1')!=environ.get('ROADSCORE_COMPOSITION_POLICY','prepared-v1'):raise ValueError('Resident composer policy differs from this launch')
diff --git a/roadscore/prototype/test_resident_worker_reset.py b/roadscore/prototype/test_resident_worker_reset.py
index 37afa4a41f..9240e75d50 100644
--- a/roadscore/prototype/test_resident_worker_reset.py
+++ b/roadscore/prototype/test_resident_worker_reset.py
@@ -77,3 +77,10 @@ def test_wrong_bank_does_not_change_existing_session(worker):
     state,saved,audio,model=worker
     with pytest.raises(ValueError,match='identity changed'):state['prepare_session'](selection(124,'b'*64))
     assert state['base_seed']==123 and audio==[]
+
+
+def test_nonresident_launch_cannot_reuse_resident_audio_with_same_seed():
+    from prepared_session import verify
+    metadata={'generation_seed':123,'prepared_profile':'prism','composition_policy':'hook-cache-v1','resident_capable':True}
+    env={'ROADSCORE_GENERATION_SEED':'123','ROADSCORE_ACE_PROFILE':'prism','ROADSCORE_COMPOSITION_POLICY':'hook-cache-v1'}
+    with pytest.raises(ValueError,match='opted-in'):verify(metadata,env)