A Reading woman has been convicted of making false rape claims.
Emma Blunden, 21, told police she had been raped in a Newbury hostel in 2008, and, in February 2010, alleged an attack by three men at a Reading house.
A total of four men were arrested following her allegations.
Det Con Clare Larkworthy said: "False reports of rape distract officers from dealing with victims of genuine crimes."
Blunden, of School Road, Reading, was convicted of two counts of perverting the course of justice at Reading Crown Court.
She was released on bail for sentencing on 14 January.
Det Con Larkworthy added: "There was significant financial cost to both investigations and a number of police officers and civilian staff hours have been taken up by investigating these incidents.