How can I limit the assignment of tags to a post in WordPress, ensuring that only existing tags are used?

    function wpsc_disable_new_tags($html, $cf)
    {
        $html = str_replace('data-tags="true"', '', $html);
        $html = str_replace('id="post_tags"', 'id="post_tags" data-tags="false"', $html);
        return $html;
    }

    add_filter('custom_tags_filter', 'wpsc_disable_new_tags', 999, 2);