But if a family is concerned, when you're actually trick-or-treating, if you watch your child go to someone's door, ring the bell, and the other family comes to the door and hands them candy, it's one way of knowing it's a safe and comfortable gift of the candy.
It used to be that if you walked in the door of a Cleveland industrial pump distributor, the guy at the door would lug you a big catalog in a three ring binder and let you spend 15 minutes flipping through it to see which ones you thought you might like to buy.