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Re:A negative captcha by 67726e on Monday September 30, 2013 @07:51AM (#6468991)
There are HTML attributes you can use to denote things like "ignore this field" for screen readers and the like.

http://www.w3.org/WAI/intro/aria

Re:A negative captcha by nyrina on Monday September 30, 2013 @10:21AM (#6469743)
And the bots knows this information as well, and uses it.