What states that as long as the car is not running doors are locked and if the car is properly ventilated providing the child is otherwise safe a child can be left in a car unattended if age 7 or olde?

The law you are referring to is often part of "Child Passenger Safety" legislation, which varies by state in the U.S. Some states allow a child aged 7 or older to be left unattended in a vehicle under specific conditions, such as when the car is not running, the doors are locked, and the vehicle is adequately ventilated. However, it is important to check local laws, as the specifics can differ significantly and may include additional safety requirements. Always prioritize the child's safety and well-being in these situations.