diff --git a/apps/openmw/mwdialogue/filter.cpp b/apps/openmw/mwdialogue/filter.cpp
index 7b5f354a2..c2d0515dd 100644
--- a/apps/openmw/mwdialogue/filter.cpp
+++ b/apps/openmw/mwdialogue/filter.cpp
@@ -136,8 +136,12 @@ bool MWDialogue::Filter::testDisposition (const ESM::DialInfo& info, bool invert
 
 bool MWDialogue::Filter::testSelectStruct (const SelectWrapper& select) const
 {
-    if (select.isNpcOnly() && mActor.getTypeName()!=typeid (ESM::NPC).name())
-        return select.isInverted();
+    if (select.isNpcOnly() && (mActor.getTypeName() != typeid (ESM::NPC).name()))
+        // If the actor is a creature, we do not test the conditions applicable
+        // only to NPCs. Such conditions can never be satisfied, apart
+        // inverted ones (NotClass, NotRace, NotFaction return true
+        // because creatures are not of any race, class or faction).
+        return select.getType() == SelectWrapper::Type_Inverted;
 
     switch (select.getType())
     {
@@ -145,6 +149,9 @@ bool MWDialogue::Filter::testSelectStruct (const SelectWrapper& select) const
         case SelectWrapper::Type_Integer: return select.selectCompare (getSelectStructInteger (select));
         case SelectWrapper::Type_Numeric: return testSelectStructNumeric (select);
         case SelectWrapper::Type_Boolean: return select.selectCompare (getSelectStructBoolean (select));
+
+        // We must not do the comparison for inverted functions (eg. Function_NotClass)
+        case SelectWrapper::Type_Inverted: return getSelectStructBoolean (select);
     }
 
     return true;
@@ -433,6 +440,30 @@ bool MWDialogue::Filter::getSelectStructBoolean (const SelectWrapper& select) co
 
             return Misc::StringUtils::lowerCase (mActor.getCell()->mCell->mName)!=select.getName();
 
+        case SelectWrapper::Function_NotLocal:
+        {
+            std::string scriptName = MWWorld::Class::get (mActor).getScript (mActor);
+
+            if (scriptName.empty())
+                // This actor has no attached script, so there is no local variable
+                return true;
+
+            const ESM::Script *script =
+                MWBase::Environment::get().getWorld()->getStore().get<ESM::Script>().find (scriptName);
+
+            std::string name = select.getName();
+
+            int i = 0;
+            for (; i < script->mVarNames.size(); ++i)
+                if (Misc::StringUtils::lowerCase(script->mVarNames[i]) == name)
+                    break;
+
+            if (i >= script->mVarNames.size())
+                return true; // script does not have a variable of this name
+
+            return false;
+        }
+
         case SelectWrapper::Function_SameGender:
 
             return (player.get<ESM::NPC>()->mBase->mFlags & ESM::NPC::Female)==
diff --git a/apps/openmw/mwdialogue/selectwrapper.cpp b/apps/openmw/mwdialogue/selectwrapper.cpp
index 77930ae42..64bd1d244 100644
--- a/apps/openmw/mwdialogue/selectwrapper.cpp
+++ b/apps/openmw/mwdialogue/selectwrapper.cpp
@@ -117,7 +117,7 @@ MWDialogue::SelectWrapper::Function MWDialogue::SelectWrapper::getFunction() con
         case '9': return Function_NotClass;
         case 'A': return Function_NotRace;
         case 'B': return Function_NotCell;
-        case 'C': return Function_Local;
+        case 'C': return Function_NotLocal;
     }
 
     return Function_None;
@@ -219,7 +219,6 @@ MWDialogue::SelectWrapper::Type MWDialogue::SelectWrapper::getType() const
     static const Function booleanFunctions[] =
     {
         Function_False,
-        Function_NotId, Function_NotFaction, Function_NotClass, Function_NotRace, Function_NotCell,
         Function_SameGender, Function_SameRace, Function_SameFaction,
         Function_PcCommonDisease, Function_PcBlightDisease, Function_PcCorprus,
         Function_PcExpelled,
@@ -231,6 +230,13 @@ MWDialogue::SelectWrapper::Type MWDialogue::SelectWrapper::getType() const
         Function_None // end marker
     };
 
+    static const Function invertedBooleanFunctions[] =
+    {
+        Function_NotId, Function_NotFaction, Function_NotClass,
+        Function_NotRace, Function_NotCell, Function_NotLocal,
+        Function_None // end marker
+    };
+
     Function function = getFunction();
 
     for (int i=0; integerFunctions[i]!=Function_None; ++i)
@@ -245,21 +251,18 @@ MWDialogue::SelectWrapper::Type MWDialogue::SelectWrapper::getType() const
         if (booleanFunctions[i]==function)
             return Type_Boolean;
 
+    for (int i=0; invertedBooleanFunctions[i]!=Function_None; ++i)
+        if (invertedBooleanFunctions[i]==function)
+            return Type_Inverted;
+
     return Type_None;
 }
 
-bool MWDialogue::SelectWrapper::isInverted() const
-{
-    char type = mSelect.mSelectRule[1];
-
-    return type=='7' || type=='8' || type=='9' || type=='A' || type=='B' || type=='C';
-}
-
 bool MWDialogue::SelectWrapper::isNpcOnly() const
 {
     static const Function functions[] =
     {
-        Function_NotFaction, SelectWrapper::Function_NotClass, SelectWrapper::Function_NotRace,
+        Function_NotFaction, Function_NotClass, Function_NotRace,
         Function_SameGender, Function_SameRace, Function_SameFaction,
         Function_PcSkill,
         Function_PcExpelled,
@@ -283,17 +286,17 @@ bool MWDialogue::SelectWrapper::isNpcOnly() const
 
 bool MWDialogue::SelectWrapper::selectCompare (int value) const
 {
-    return selectCompareImp (mSelect, value)!=isInverted(); // logic XOR
+    return selectCompareImp (mSelect, value);
 }
 
 bool MWDialogue::SelectWrapper::selectCompare (float value) const
 {
-    return selectCompareImp (mSelect, value)!=isInverted(); // logic XOR
+    return selectCompareImp (mSelect, value);
 }
 
 bool MWDialogue::SelectWrapper::selectCompare (bool value) const
 {
-    return selectCompareImp (mSelect, static_cast<int> (value))!=isInverted(); // logic XOR
+    return selectCompareImp (mSelect, static_cast<int> (value));
 }
 
 std::string MWDialogue::SelectWrapper::getName() const
diff --git a/apps/openmw/mwdialogue/selectwrapper.hpp b/apps/openmw/mwdialogue/selectwrapper.hpp
index c27339afa..f4bc898a4 100644
--- a/apps/openmw/mwdialogue/selectwrapper.hpp
+++ b/apps/openmw/mwdialogue/selectwrapper.hpp
@@ -22,6 +22,7 @@ namespace MWDialogue
                 Function_NotClass,
                 Function_NotRace,
                 Function_NotCell,
+                Function_NotLocal,
                 Function_Local,
                 Function_Global,
                 Function_SameGender, Function_SameRace, Function_SameFaction,
@@ -50,7 +51,8 @@ namespace MWDialogue
                 Type_None,
                 Type_Integer,
                 Type_Numeric,
-                Type_Boolean
+                Type_Boolean,
+                Type_Inverted
             };
 
         private:
@@ -67,8 +69,6 @@ namespace MWDialogue
 
             Type getType() const;
 
-            bool isInverted() const;
-
             bool isNpcOnly() const;
             ///< \attention Do not call any of the select functions for this select struct!
 
diff --git a/apps/openmw/mwworld/class.cpp b/apps/openmw/mwworld/class.cpp
index 985d35d45..108efddd8 100644
--- a/apps/openmw/mwworld/class.cpp
+++ b/apps/openmw/mwworld/class.cpp
@@ -169,7 +169,7 @@ namespace MWWorld
 
     bool Class::hasDetected (const MWWorld::Ptr& ptr, const MWWorld::Ptr& ptr2) const
     {
-        return false;
+        return true;
     }
 
     float Class::getArmorRating (const MWWorld::Ptr& ptr) const