A Bedfordshire police officer accused of trying to escape two speeding fines by lying, has been cleared of one of the charges.
Metropolitan officer Mark Williams, 30, of Luton, denied twice perverting the course of justice at Luton Crown Court.
The prosecution said he falsely claimed his numberplate had been cloned both times his car was caught speeding.
The jury was discharged when they failed reach a majority verdict on the second charge.
Judge Barbara Mensah gave the prosecution seven days to decide if they will pursue a retrial on the one remaining charge.
Mr Williams has been released on bail.
The charges were alleged to have taken place in 2008 and 2010.