Councillors have overwhelmingly voted against a merger between Devon and Cornwall Police with their neighbouring force in Dorset.
At a meeting in Plymouth the proposal to create the country's fifth largest constabulary was rejected by councillors, 12 votes to 4.
Devon and Cornwall's Police and Crime Commissioner, Alison Hernandez, rejects the plans for a single police force, which are now unable to move any further.
Ms Hernandez says, "I will not be submitting plans to the Home Office, they wont be going any further. We'll be going back to business as usual."
Any decision would need approval from the chief constables of both forces and both Police and Crime Commissioners.
Dorset's Police Commissioner, Martyn Underhill, released a statement following the verdict:
The business case is proved and I am frustrated that a politician has stopped a proposal put forward and supported by operational policing leaders.
Supporters of the merger argue that it would save money, allowing a single force to increase the number of officers working across the three counties.