The toddler died after he was trapped inside a hot car while in the custody of a worker contracted by the Alabama Department of Human Resources, the state’s child protective services agency
As you might expect, there are quite disturbing details in the article.
I immediately thought of the same article.
Edit: What is the known solution? Putting the child in the front seat and disabling the airbag?
Back seat sensors. They cost practically nothing compared to the cost of a car.