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How to use a captcha to allow asks/answers to new users to avoid spam

Hi, I've deployed an askbot website and I've seen one question from a spam bot, so I'm thinking about implement a captcha to avoid spam bots are able to post/answer any question. Using a minimum karma value to allow users to post/answer questions is not useful in this case because I need that new users are able to post/answer questions.

Has someone implemented this captcha system to allow new users to post/answer questions and avoid spam bots?

I need some help with this issue. Thank you.