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That's a bit meta, a bit stackoverflow question - what's the point of asking a CAPTCHA challenge to a user that's already replied the CAPTCHA question properly?

I've been giving several short answers on SO and I got the time limit throttle. I kept pressing "submit" because I didn't know whether the three minutes had already passed or not and pretty often I would get challenged by the CAPTCHA.

Even after replying to it correctly, I got another CAPTCHA question next time I rushed the "submit" button. Why is it made this way?

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    Because you're a bot. A clever one, I have to admit, but a bot nonetheless. – Bart Nov 2 '12 at 20:29
  • Haha! (sorry, had to). I actually wonder if I'd pass the Turing test right now. I'm pretty sleepy. – d33tah Nov 2 '12 at 20:31
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    I think this is somewhat by design, if you perform enough actions you might get more than one CAPTCHA. – NullUserException อ_อ Nov 2 '12 at 21:11
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A once-per-session verification would mean that a human could easily solve the captcha once and then have a valid session for the bot to run in. For that reason one cannot be 100 % certain that you to are a human so you get the capctha again if you show too much of a bot-like behavior.

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