CAPTCHA involves using a distorted image of letters or numbers that can be identified by humans but not by computers using OCR (optical character recognition).
WebInjection uses CAPTCHA technology in all the contact forms created for clients.
We also employ php form error validation scripting. This works on two levels. Firstly, to make sure that users don't miss any important fields and secondly to make sure no malicious users are entering script code. Script code can be used to overtake your servers to send spam emails to the world!