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Re:Are You a Robot? Introducing “No CAPTCHA ReCAPTCHA” by junto on Wednesday December 03, 2014 @11:38AM (#8694665)
I tried this demo (https://www.google.com/recaptcha/api2/demo) in a new incognito window. Then in devtools:

  javascript:if(!window.jQuery||confirm('Overwrite\x20current\x20version?\x20v'+jQuery.fn.jquery))(function(d,s){s=d.createElement('script');s.src='https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.js';(d.head||d.documentElement).appendChild(s)})(document);
  $('iframe').contents().find('.recaptcha-checkbox-checkmark').click()
I got an extra verification (enter two bits of text)
Re:Are You a Robot? Introducing “No CAPTCHA ReCAPTCHA” by JoblessWonder on Wednesday December 03, 2014 @12:03PM (#8694851)
Probably the incognito window. It seems to rely heavily on cookies (likely linked to their analytics data.)