Ajax Validation for reCaptcha

Just found out that reCaptcha actually rejects CAPTCHAs which are submitted to their server more than once. Since I was using the WP-reCAPTCHA plugin, the plugin resubmitted the CAPTCHA after my AJAX submission. So I just commented out a line from the plugin that does the submission, which is in file recaptcha.php, line 27:

$this->register_filters();