public function member($group, $driver = null, $user = null)
	{
		$user = $user ?: $this->get_user_id();

		if ($driver === null)
		{
			foreach (\Auth::group(true) as $g)
			{
				if ($g->member($group, $user))
				{
					return true;
				}
			}

			return false;
		}

		return \Auth::group($driver)->member($group, $user);
	}