Existing law generally regulates the business of renting passenger vehicles to the public. The law prohibits a rental company from taking various actions, including requiring the purchase of a damage waiver, optional insurance, or another optional good or service, and using electronic surveillance technology to track a renter in order to impose fines or surcharges relating to the renter's use of a rental vehicle. This bill would require any privately owned vehicle rented by, or furnished to, any federal, state, or local law enforcement agency for the use of detaining, arresting, or transporting persons who have violated, or are suspected of having violated, any law, to display a temporary decal displaying the agency name and logo, as specified. The bill would authorize certain attorneys, including the Attorney General, to pursue a civil action against the entity renting the vehicle from the private owner for failure to comply with these provisions. The bill would require the rental car contract to include a term that compliance with state law is mandatory. The bill would exempt privately owned vehicles rented or otherwise furnished or loaned to a law enforcement agency for specified purposes and rental car contracts entered into prior to January 1, 2027, from these provisions. The bill would make related findings and declarations.