Possible to disable cookies in recaptcha?

[schnippy]

I'm working with a client that has a strict no third-party cookies
policy so we're trying to find a way around the cookies that reCAPTCHA
(sometimes?) is setting when it displays the form. I've worked through
the API documentation and I don't see any mention of a 'disable
cookies' configuration setting but I have seen reference to a
'nocookie' parameter you can pass in the string:

<script type="text/javascript" src="http://api.recaptcha.net/challenge?
k=<my public key>&nocookie=1">

but having trouble confirming that this is actually working because
reCAPTCHA doesn't appear to always set cookies. I haven't seen cookies
dropped when this flag was set but can't confirm the reverse when this
is not set.

Is there a better way to disable these cookies?

I'm using the PHP recaptchalib (through the Drupal module) to set this
parameter.

[Stephan Tschierschwitz]

did you find out more about the handling of cookies related to recaptcha? I am looking for a documentation which cookies are used by recaptcha