diff --git a/lib/pundit.rb b/lib/pundit.rb
index efb49e7..29e84dc 100644
--- a/lib/pundit.rb
+++ b/lib/pundit.rb
@@ -63,12 +63,14 @@ module Pundit
 
   def policy_scope(scope)
     @_policy_scoped = true
-    Pundit.policy_scope!(pundit_user, scope)
+    @policy_scope or Pundit.policy_scope!(pundit_user, scope)
   end
+  attr_writer :policy_scope
 
   def policy(record)
-    Pundit.policy!(pundit_user, record)
+    @policy or Pundit.policy!(pundit_user, record)
   end
+  attr_writer :policy
 
   def pundit_user
     current_user
diff --git a/spec/pundit_spec.rb b/spec/pundit_spec.rb
index 9dc7a89..3bcfe6a 100644
--- a/spec/pundit_spec.rb
+++ b/spec/pundit_spec.rb
@@ -242,6 +242,13 @@ describe Pundit do
     it "throws an exception if the given policy can't be found" do
       expect { controller.policy(article) }.to raise_error(Pundit::NotDefinedError)
     end
+
+    it "allows policy to be injected" do
+      new_policy = OpenStruct.new
+      controller.policy = new_policy
+
+      controller.policy(post).should == new_policy
+    end
   end
 
   describe ".policy_scope" do
@@ -252,5 +259,12 @@ describe Pundit do
     it "throws an exception if the given policy can't be found" do
       expect { controller.policy_scope(Article) }.to raise_error(Pundit::NotDefinedError)
     end
+
+    it "allows policy_scope to be injected" do
+      new_scope = OpenStruct.new
+      controller.policy_scope = new_scope
+
+      controller.policy_scope(post).should == new_scope
+    end
   end
 end