re: 3 year old boys freezes to death outside of home

Exactly the reason why when we bought our current house, I removed all and deadbolts that lead to the outside and replaced them with keyed deadbolts with matching key knobs. All doors use one key. They stay locked at all times unless we are physically walking through them or doing something outside where we are able to monitor our girls. We have the keys in places that the kids can't reach, even from a chair.