in reply to
Re^2: Is using 'Cookies' impractical for 'Contact Us' forms?
in thread Is using 'Cookies' impractical for 'Contact Us' forms?
"Hello, I am a blind person and I'm unable to navigate your website"
I would deal with the problem when it comes to it instead of overdesigning the most basic functionality people need to tell you about faults with the website. As long as your Contact Us form does not send mail and maybe has some (IP-based) throttling, it should be possible to stem a flood of bots.