diff --git a/app/controllers/user_controller.rb b/app/controllers/user_controller.rb
index 0d8f6784..32d0229f 100644
--- a/app/controllers/user_controller.rb
+++ b/app/controllers/user_controller.rb
@@ -1,6 +1,6 @@
 class UserController < ApplicationController
   def show
-    @user = User.find_by_screen_name!(params[:username])
+    @user = User.where('LOWER(screen_name) = ?', params[:username].downcase).first
     @answers = @user.answers.reverse_order.paginate(page: params[:page])
     respond_to do |format|
       format.html
@@ -23,7 +23,7 @@ class UserController < ApplicationController
 
   def followers
     @title = 'Followers'
-    @user = User.find_by_screen_name!(params[:username])
+    @user = User.where('LOWER(screen_name) = ?', params[:username].downcase).first
     @users = @user.followers.reverse_order.paginate(page: params[:page])
     @type = :friend
     render 'show_follow'
@@ -31,7 +31,7 @@ class UserController < ApplicationController
 
   def friends
     @title = 'Following'
-    @user = User.find_by_screen_name!(params[:username])
+    @user = User.where('LOWER(screen_name) = ?', params[:username].downcase).first
     @users = @user.friends.reverse_order.paginate(page: params[:page])
     @type = :friend
     render 'show_follow'
diff --git a/app/models/inbox.rb b/app/models/inbox.rb
index 5084084a..5c664c4a 100644
--- a/app/models/inbox.rb
+++ b/app/models/inbox.rb
@@ -13,11 +13,7 @@ class Inbox < ActiveRecord::Base
   end
 
   def remove
-    unless self.question.user.nil?
-      self.question.user.decrement! :asked_count if self.question.answer_count == 1
-    end
-
-    self.question.destroy if self.question.answer_count == 1
+    self.question.destroy if self.question.can_be_removed?
     self.destroy
   end
 end
diff --git a/app/models/question.rb b/app/models/question.rb
index adc1f802..0408a02b 100644
--- a/app/models/question.rb
+++ b/app/models/question.rb
@@ -3,4 +3,11 @@ class Question < ActiveRecord::Base
   has_many :answers
 
   validates :content, length: { maximum: 255 }
+
+  def can_be_removed?
+    return false if self.answers.count > 0
+    return false if Inbox.where(question: self).count > 1
+    self.user.decrement! :asked_count
+    true
+  end
 end