diff --git a/ion/services/sa/instrument/resource_lcs_policy.py b/ion/services/sa/instrument/resource_lcs_policy.py
index 67bbb141a..b4f0246cc 100644
--- a/ion/services/sa/instrument/resource_lcs_policy.py
+++ b/ion/services/sa/instrument/resource_lcs_policy.py
@@ -146,6 +146,11 @@ def lce_precondition_retire(self, agent_id):
         ret = (0 == self._find_having(RT.InstrumentAgentInstance, PRED.hasAgentDefinition, agent_id))
         return self._make_result(ret, "InstrumentAgentInstance(s) are still using this InstrumentAgent")
 
+
+    def precondition_delete(self, agent_id):
+        ret = (0 == self._find_having(RT.InstrumentAgentInstance, PRED.hasAgentDefinition, agent_id))
+        return self._make_result(ret, "InstrumentAgentInstance(s) are still using this InstrumentAgent")
+
 class ModelPolicy(ResourceLCSPolicy):
     def lce_precondition_plan(self, model_id):
         # always OK
@@ -191,6 +196,33 @@ def lce_precondition_retire(self, model_id):
 
         return self._make_fail("Wrong model resource type (got '%s')" % model_type)
 
+    def precondition_delete(self, model_id):
+
+        model_type = self._get_resource_type_by_id(model_id)
+
+        if RT.SensorModel == model_type:
+            return 0 == len(self._find_having(RT.SensorDevice, PRED.hasModel, model_id))
+
+        if RT.InstrumentModel == model_type:
+            if 0 < len(self._find_having(RT.InstrumentDevice, PRED.hasModel, model_id)):
+                return self._make_fail("InstrumentDevice(s) are using this model")
+            if 0 < len(self._find_having(RT.InstrumentAgent, PRED.hasModel, model_id)):
+                return self._make_fail("InstrumentAgent(s) are using this model")
+            if 0 < len(self._find_having(RT.InstrumentSite, PRED.hasModel, model_id)):
+                return self._make_fail("InstrumentSite(s) are using this model")
+            return self._make_pass()
+
+        if RT.PlatformModel == model_type:
+            if 0 < len(self._find_having(RT.PlatformDevice, PRED.hasModel, model_id)):
+                return self._make_fail("PlatformDevice(s) are using this model")
+            if 0 < len(self._find_having(RT.PlatformAgent, PRED.hasModel, model_id)):
+                return self._make_fail("PlatformAgent(s) are using this model")
+            if 0 < len(self._find_having(RT.PlatformSite, PRED.hasModel, model_id)):
+                return self._make_fail("PlatformSite(s) are using this model")
+            return self._make_pass()
+
+        return self._make_fail("Wrong model resource type (got '%s')" % model_type)
+
 
 class DevicePolicy(ResourceLCSPolicy):
 
@@ -370,6 +402,10 @@ def lce_precondition_retire(self, device_id):
 
         return self._make_fail("Wrong device resource type (got '%s')" % device_type)
 
+    def precondition_delete(self, device_id):
+        return self.lce_precondition_retire(device_id)
+
+
 class SitePolicy(ResourceLCSPolicy):
     def lce_precondition_plan(self, site_id):
         # always OK
@@ -400,8 +436,26 @@ def lce_precondition_deploy(self, site_id):
         return self._make_pass()
 
     def lce_precondition_retire(self, site_id):
-        # todo:
-        return self._make_pass()
+        # todo: Sites and all subclasses can not be retired if they have children or if they are
+        # not associated to a deployment
+        site_type = self._get_resource_type_by_id(site_id)
+
+        if RT.InstrumentSite == site_type:
+            if 0 < len(self._find_stemming(site_id, PRED.hasDeployment, RT.Deployment)):
+                return self._make_fail("Site is still assigned to a deployment")
+
+        if RT.PlatformSite == site_type:
+            if 0 < len(self._find_stemming(site_id, PRED.hasSite, RT.PlatformDevice)):
+                return self._make_fail("Device is still assigned a child platform site")
+            if 0 < len(self._find_stemming(site_id, PRED.hasDevice, RT.InstrumentDevice)):
+                return self._make_fail("Device is still hasSite a child instrument site")
+            if 0 < len(self._find_stemming(site_id, PRED.hasDeployment, RT.Deployment)):
+                return self._make_fail("Site is still assigned to a deployment")
+
+        return self._make_fail("Wrong device resource type (got '%s')" % site_type)
+
+    def precondition_delete(self, site_id):
+        return self.lce_precondition_retire(site_id)
 
 
 class DataProductPolicy(ResourceLCSPolicy):