The recording includes McFarlane saying to Mauro Demetrio "The problem with you is that you will always be a n***er." It also includes one of his colleagues boasting about strangling Demetrio. Even through Demetrio reported the assault, and marks were left on his neck as evidence of it, no charges were brought. The CPS had tried to bring no charges at all. Indeed, when Demetrio handed his phone in to Forest Gate police station, PC Joe Harrington, another of the pigs who had been present at the assault arrested him on a trumped up accusation of theft from an ATM during the London riots. McFarlane was only charged following the publication of the recording on the internet, where it quickly went viral. You can listen to it here.
In case anyone's wondering how a jury can fail to reach a verdict in a case like this, it's worth bearing in mind that 90% of juries in this country are vetted by Special Branch (as revealed by Newsnight some 20 years ago).
The problem with PC Alex McFarlane is, he'll always be a copper. ACAB.