Why don't the automakers create something that will prevent kids from dying in locked cars in the heat?

Some kind of warning system or a reminder or alert on your phone, or if the car detects weight on the seat when the engine is off it can call you or text you or sound an alarm or call 911 even.

There must be some technology that can prevent this.

Why dont the automakers create something that will prevent kids from dying in locked cars in the heat?
Why don't the automakers create something that will prevent kids from dying in locked cars in the heat?
Post Opinion