What I wonder about is why someone hasn't thought up a simple little device to counter this possibility? I mean, your door dings if you open it while the keys are still in the ignition. It seems a simple matter to tinker together a little device that dings if the carseat is clicked while the engine is off. Run it into the cigarette lighter or something so it can sense whether the car is on or off and program it to sound once the power cuts. It'd probably save a couple lives.
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