diff --git a/lib/verification.rb b/lib/verification.rb
index 5b70264..ebab58c 100755
--- a/lib/verification.rb
+++ b/lib/verification.rb
@@ -56,9 +56,6 @@ module Verification
   # TODO: rikki?
   # Returns true if params (or its keys) are a subset of filter
   def self.contain(params, filter)
-    (params.instance_of?(Array) ? params : params.keys).each do |key|
-      return false unless filter.include? key.to_sym
-    end
-    true
+    ((params.instance_of?(Array) ? params : params.keys) - filter).empty?
   end
 end