Fatal Distraction: Forgetting a Child in the Backseat of a Car Is a Horrifying Mistake. Is It a Crime? - The Washington Post: "“Memory is a machine,” he says, “and it is not flawless. Our conscious mind prioritizes things by importance, but on a cellular level, our memory does not. If you’re capable of forgetting your cellphone, you are potentially capable of forgetting your child.”"
'via Blog this'
This horrific story, in this paragraph, tells me that there is a technological solution. I do forget my cell phone in the car from time to time; but I have a technological hint that I've done so: My bluetooth headset says "Phone disconnected".
What if carseats had a small, low power bluetooth signal to our smartphones, on whenever the seatbelt is engaged, and an app that detected whether that signal was present or not?