diff --git a/lib/application_checker.rb b/lib/application_checker.rb
index da43304..c4bec6c 100644
--- a/lib/application_checker.rb
+++ b/lib/application_checker.rb
@@ -50,6 +50,24 @@ module Rails
           )
         end
       end
+      
+      def check_validation_methods
+        files = []
+        
+        ["validate_on_create", "validate_on_update"].each do |v|
+          lines = grep_for(v, "app/models/")
+          files += extract_filenames(lines) || []
+        end
+        
+        if files
+          alert(
+            "Removed validate_on_* methods",
+            "Validate-on-callback methods (validate_on_create/validate_on_destroy) have been removed",
+            "https://rails.lighthouseapp.com/projects/8994/tickets/3880-validate_on_create-and-validate_on_update-no-longer-seem-to-exist",
+            files
+          )
+        end
+      end
 
       # Check for deprecated router syntax
       def check_routes
diff --git a/test/application_checker_test.rb b/test/application_checker_test.rb
index 53bdb39..d0b23df 100644
--- a/test/application_checker_test.rb
+++ b/test/application_checker_test.rb
@@ -57,6 +57,13 @@ class ApplicationCheckerTest < ActiveSupport::TestCase
 
     assert @checker.alerts.has_key?("Soon-to-be-deprecated ActiveRecord calls")
   end
+  
+  def test_check_validation_methods
+    make_file("app/models", "post.rb", "validate_on_create :comments_valid?")
+    @checker.check_validation_methods
+    
+    assert @checker.alerts.has_key?("Removed validate_on_* methods")
+  end
 
   def test_named_scope_left_over
     make_file("app/models", "post.rb", "named_scope :failure")