People who are suppliers to governmental or educational agencies must comply
as well in the US. Whether or not general businesses must comply under the
Americans with Disabilities Act is still undecided. The Department of
Justice takes the position that the ADA applies to all business on the
internet while some of the courts have disagreed. Others have said in cases
decided on other grounds that the ADA does apply. So right now you could
take either position in the US and find support for it. One of these days
either Congress will clarify the law or the US Supreme Court will rule on it
and then it will be settled one way or the other.  

Either way I discourage the use of a twisted text image as a CAPTCHA. A
better method is one that Eric Meyers has a WordPress plug in for. A simple
question must be answered before the email address is displayed. Since you
can use random questions it is hard for a bot to figure them out yet a
screen reader has no problem reading them or a person figuring out the
answer. I noticed that PayPal is using a visual CAPTCHA but has a link to an
audio version of the same image for those who are visually impaired. Course
I've missed some of the visual CAPTCHA because the characters were so
twisted and obscured with random 'noise' or lines that even with normal
vision it was impossible to tell 0 from O or even Q or 5 from S.

Cheryl D. Wise
Certified Professional Web Developer
Microsoft FrontPage MVP
http://wiserways.com 
Office: 713-353-0139 

-----Original Message-----
From: David Blakey 

>Be aware that a CAPTCHA or Turin test that uses images is inaccessible 
>so do not use one on a site that is required to comply with 
>accessibility requirments such as Section 508 in the US or the equivalent
in the UK.
>
>Some sites get around the accessibility issue by requiring people to 
>answer a question while others offer a link an audio file that reads 
>the contents of an image.

I agree. In fact, UK law appears to be tougher than US law, in that all
service providers, not just federal and other government agencies, must
comply.


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