A jury has failed to reach a verdict in the trial of a policeman accused of racially abusing a suspect days after the riots in London last year.
PC Alex MacFarlane, 53, had denied causing racially aggravated intentional harassment, alarm or distress to Mauro Demetrio on 11 August 2011.
Southwark Crown Court heard Mr Demetrio believed he was stopped on suspicion of drug-driving because he was black.
A retrial is expected begin on Monday with a new jury.
The original jury of five men and seven women retired to consider its verdict on Wednesday, but was discharged after being unable to reach a decision.
In April, the Crown Prosecution Service (CPS) in London, ordered that Mr MacFarlane be charged after it reviewed an earlier decision not to prosecute.
He was charged with intending to cause harassment, alarm or distress to his victim and using threatening, abusive or insulting words or behaviour.