Well, 5th amendment protections, and inability to determine whether a person even remembers the key, means that serving a warrant doesn't always work either. B

Well, 5th amendment protections, and inability to determine whether a person even remembers the key, means that serving a warrant doesn't always work either. But then, neither did breaking down the door and ransacking the obvious physical target pre-internet days always work. And everyone understood a suspect had no obligation to tell the feds where he hid the goods.