laravel constructor redirect

I have a method for check user role is admin or not and use return redirect('/')->send(); to homepage in Condition at the wrong time but before redirect display my view in other methods and after 1sec redirect to homepage how i can redirect in moment time without index display view

My Controller :

    class AdminController extends Controller
{
    public function __construct()
    {
       if(Auth::check())
       {
          $user=Auth::user();
          if($user->role!='admin')
          {
             return redirect('/')->send();
          }
       }
       else
       {
         return redirect('/')->send();
       }
    }
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {


        return View('admin/index');
    }


}

via Chebli Mohamed