It seems both players have admitted using the language but not with racist intent.
I believe it was the Daily Mirror on 28th October that stated that Suarez had used the term 'negro', but the term was lost in different cultural terms. Emre used the same excuse a few years ago and was successful in doing so.
Would it not have been easier if Terry had said, "I didn't used a racist slur against you Anton". Why would Suarez use the word "negro" if not as an insult, would he say "Good play there, Evra, you wonderful negro"?
If both, or either, have used the words, they should be found guilty, no matter what excuse they give.
I believe that both will be found innocent, the kick racism out of football scheme is only of use to the FA to show them in a positive light, the moment racism is accused they let the matter fly once it has dropped under the public radar.