* To investigate the theft. Police will often impound a stolen car to investigate the theft. They will look for evidence of the crime, such as fingerprints or DNA, and they will try to identify the person or people who stole the car.
* To prevent the car from being stolen again. A stolen car is more likely to be stolen again than a car that has not been stolen. By impounding the car, police can help to ensure that it does not fall into the hands of criminals again.
* To protect the owner of the car. If a stolen car is not impounded, the owner may be liable for any damage that is done to the car while it is in the possession of the thief. By impounding the car, police can help to protect the owner from this liability.
In addition, some jurisdictions have laws that require stolen cars to be impounded. This is especially true if the car was used in a crime, such as a robbery or a hit-and-run accident.
In general, impounding a stolen car is a way for police to protect the public and investigate the crime.