diff --git a/app/controllers/impressionist_controller.rb b/app/controllers/impressionist_controller.rb
index d9a9119..b92fcbf 100644
--- a/app/controllers/impressionist_controller.rb
+++ b/app/controllers/impressionist_controller.rb
@@ -3,7 +3,7 @@ require 'digest/sha2'
 module ImpressionistController
   module ClassMethods
     def impressionist(opts={})
-      before_filter { |c| c.impressionist_subapp_filter(opts)}
+      before_filter { |c| c.impressionist_subapp_filter(opts) }
     end
   end
 
@@ -50,7 +50,8 @@ module ImpressionistController
         :request_hash => @impressionist_hash,
         :session_hash => session_hash,
         :ip_address => request.remote_ip,
-        :referrer => request.referer
+        :referrer => request.referer,
+        :params => params_hash
         )
     end
 
@@ -81,9 +82,28 @@ module ImpressionistController
     end
 
     def unique?(unique_opts)
-      return unique_opts.blank? || !Impression.where(unique_query(unique_opts)).exists?
+      return unique_opts.blank? || check_impression?(unique_opts)
     end
 
+    def check_impression?(unique_opts)
+      impressions = Impression.where(unique_query(unique_opts - [:params]))
+      check_unique_impression?(impressions, unique_opts)
+    end
+
+    def check_unique_impression?(impressions, unique_opts)
+      impressions_present = impressions.exists?
+      impressions_present && unique_opts_has_params?(unique_opts) ? check_unique_with_params?(impressions) : !impressions_present
+    end
+
+    def unique_opts_has_params?(unique_opts)
+      unique_opts.include?(:params)
+    end
+
+    def check_unique_with_params?(impressions)
+      request_param = params_hash
+      impressions.detect{|impression| impression.params == request_param }.nil?
+    end
+    
     # creates the query to check for uniqueness
     def unique_query(unique_opts,impressionable=nil)
       full_statement = direct_create_statement({},impressionable)
@@ -112,6 +132,10 @@ module ImpressionistController
       request.session_options[:id]
     end
 
+    def params_hash
+      request.params.except(:controller, :action, :id)
+    end
+
     #use both @current_user and current_user helper
     def user_id
       user_id = @current_user ? @current_user.id : nil rescue nil
diff --git a/app/models/impression.rb b/app/models/impression.rb
index 9cb2d4e..0fbfd97 100644
--- a/app/models/impression.rb
+++ b/app/models/impression.rb
@@ -1,2 +1,4 @@
 class Impression
+  attr_accessible :params
+  store :params
 end
diff --git a/tests/test_app/app/controllers/widgets_controller.rb b/tests/test_app/app/controllers/widgets_controller.rb
index b6b99a7..e533893 100644
--- a/tests/test_app/app/controllers/widgets_controller.rb
+++ b/tests/test_app/app/controllers/widgets_controller.rb
@@ -1,5 +1,5 @@
 class WidgetsController < ApplicationController
-  impressionist :actions=>[:show,:index], :unique => [:controller_name,:action_name,:impressionable_id]
+  impressionist :actions=>[:show, :index], :unique => [:controller_name, :action_name, :impressionable_id, :params]
 
   def show
   end
diff --git a/tests/test_app/db/migrate/20130719024021_create_impressions_table.rb b/tests/test_app/db/migrate/20130719024021_create_impressions_table.rb
index c874863..d3dec32 100644
--- a/tests/test_app/db/migrate/20130719024021_create_impressions_table.rb
+++ b/tests/test_app/db/migrate/20130719024021_create_impressions_table.rb
@@ -11,6 +11,7 @@ class CreateImpressionsTable < ActiveRecord::Migration
       t.string :ip_address
       t.string :session_hash
       t.text :message
+      t.text :params
       t.text :referrer
       t.timestamps
     end
@@ -21,6 +22,7 @@ class CreateImpressionsTable < ActiveRecord::Migration
     add_index :impressions, [:controller_name,:action_name,:request_hash], :name => "controlleraction_request_index", :unique => false
     add_index :impressions, [:controller_name,:action_name,:ip_address], :name => "controlleraction_ip_index", :unique => false
     add_index :impressions, [:controller_name,:action_name,:session_hash], :name => "controlleraction_session_index", :unique => false
+    add_index :impressions, [:impressionable_type, :impressionable_id, :params], :name => "poly_params_request_index", :unique => false
     add_index :impressions, :user_id
   end
 
diff --git a/tests/test_app/db/schema.rb b/tests/test_app/db/schema.rb
index fd9df3f..cac1d3b 100644
--- a/tests/test_app/db/schema.rb
+++ b/tests/test_app/db/schema.rb
@@ -41,6 +41,7 @@ ActiveRecord::Schema.define(:version => 20150207140310) do
     t.string   "ip_address"
     t.string   "session_hash"
     t.text     "message"
+    t.text     "params"
     t.text     "referrer"
     t.datetime "created_at",          :null => false
     t.datetime "updated_at",          :null => false
@@ -50,6 +51,7 @@ ActiveRecord::Schema.define(:version => 20150207140310) do
   add_index "impressions", ["controller_name", "action_name", "request_hash"], :name => "controlleraction_request_index"
   add_index "impressions", ["controller_name", "action_name", "session_hash"], :name => "controlleraction_session_index"
   add_index "impressions", ["impressionable_type", "impressionable_id", "ip_address"], :name => "poly_ip_index"
+  add_index "impressions", ["impressionable_type", "impressionable_id", "params"], :name => "poly_params_request_index"
   add_index "impressions", ["impressionable_type", "impressionable_id", "request_hash"], :name => "poly_request_index"
   add_index "impressions", ["impressionable_type", "impressionable_id", "session_hash"], :name => "poly_session_index"
   add_index "impressions", ["impressionable_type", "message", "impressionable_id"], :name => "impressionable_type_message_index"
diff --git a/tests/test_app/spec/controllers/articles_controller_spec.rb b/tests/test_app/spec/controllers/articles_controller_spec.rb
index c32ea15..15454cd 100644
--- a/tests/test_app/spec/controllers/articles_controller_spec.rb
+++ b/tests/test_app/spec/controllers/articles_controller_spec.rb
@@ -53,8 +53,24 @@ describe ArticlesController do
     click_link "Same Page"
     Impression.last.referrer.should eq "http://test.host/articles/1"
   end
+
+  it "should log request with params (checked = true)" do
+    get "show", id: 1, checked: true
+    Impression.last.params.should eq({"checked"=>true})
+    Impression.last.request_hash.size.should eq 64
+    Impression.last.ip_address.should eq "0.0.0.0"
+    Impression.last.session_hash.size.should eq 32
+    Impression.last.referrer.should eq nil
+  end
+
+  it "should log request with params {}" do
+    get "index"
+    Impression.last.params.should eq({})
+    Impression.last.request_hash.size.should eq 64
+    Impression.last.ip_address.should eq "0.0.0.0"
+    Impression.last.session_hash.size.should eq 32
+    Impression.last.referrer.should eq nil
+  end
 end
 
 
-
-
diff --git a/tests/test_app/spec/controllers/posts_controller_spec.rb b/tests/test_app/spec/controllers/posts_controller_spec.rb
index 78cbe84..78827e2 100644
--- a/tests/test_app/spec/controllers/posts_controller_spec.rb
+++ b/tests/test_app/spec/controllers/posts_controller_spec.rb
@@ -16,4 +16,13 @@ describe PostsController do
     Post.first.impressions.last.user_id.should eq 123
   end
 
+  it "should log impression at the action level with params" do
+    get "show", id: 1, checked: true
+    Impression.all.size.should eq 12
+    Impression.last.params.should eq({"checked"=>true})
+    Impression.last.controller_name.should eq "posts"
+    Impression.last.action_name.should eq "show"
+    Impression.last.impressionable_type.should eq "Post"
+    Impression.last.impressionable_id.should eq 1
+  end
 end
diff --git a/tests/test_app/spec/controllers/widgets_controller_spec.rb b/tests/test_app/spec/controllers/widgets_controller_spec.rb
index 08e2569..61f7c28 100644
--- a/tests/test_app/spec/controllers/widgets_controller_spec.rb
+++ b/tests/test_app/spec/controllers/widgets_controller_spec.rb
@@ -44,7 +44,6 @@ describe WidgetsController do
     it "should log unique impressions only once per id" do
       get "show", :id=> 1
       Impression.all.size.should eq 12
-
       get "show", :id=> 2
       Impression.all.size.should eq 13
 
@@ -57,4 +56,36 @@ describe WidgetsController do
 
   end
 
+  context "Impresionist unique params options" do
+    it "should log unique impressions at the per action and params level" do
+      get "show", :id => 1
+      Impression.all.size.should eq 12
+      get "show", :id => 2, checked: true
+      Impression.all.size.should eq 13	
+      get "show", :id => 2, checked: false
+      Impression.all.size.should eq 14
+      get "index"
+      Impression.all.size.should eq 15
+    end
+
+    it "should not log impression for same params and same id" do
+      get "show", :id => 1
+      Impression.all.size.should eq 12
+      get "show", :id => 1
+      Impression.all.size.should eq 12
+      get "show", :id => 1, checked: true
+      Impression.all.size.should eq 13	
+      get "show", :id => 1, checked: false
+      Impression.all.size.should eq 14
+      get "show", :id => 1, checked: true
+      Impression.all.size.should eq 14
+      get "show", :id => 1, checked: false
+      Impression.all.size.should eq 14
+      get "show", :id => 1
+      Impression.all.size.should eq 14
+      get "show", :id => 2
+      Impression.all.size.should eq 15
+    end
+  end
+
 end