The FA’s statement is up on their website. The pertinent bit:
The evidence for the allegation came from one witness, Ramires. Ramires, whose first language is not English, explained that his instinctive reaction was to seek confirmation from John Obi Mikel as to what the referee had said.
John Obi Mikel, who was being spoken to by the referee, was much closer to the referee than Ramires and did not hear what it is suggested was said to him.
Three other witnesses, i.e. the other Match Officials, to whom everything said by referee was relayed via their communication equipment, are adamant the alleged words were not uttered.
There is nothing in the video footage to support the allegation.
For completeness, but of lesser weight, two other players, whose first language is English and were in the vicinity, did not hear anything untoward.
Moreover, the FA won’t take action against Ramires for raising the charge as they believe he brought it in “good faith.” No real villains here, right? Ramires believed he heard something, went through the channels to report it, there was an investigation, no evidence was found to support the claim, charges dropped, Mark Clattenburg returns to football.
BREAKING NEWS: John Obi Mikel charged with used threatening / abusive and/or insulting words and/or behaviour during game v Man United. #cfc
— ESPN FC (@ESPNFC) November 22, 2012
And round and round we go…