Daniel, I'll answer your question.

It's a legal urban legend. In other words, it doesn't mean squat.

Another one I hear: "You have to live with someone for seven years before a common law marriage is valid."

Google possession nine tenths law for tons of info.

Now, go read stuff by Bryan Garner.

http://www.lawprose.org/

He is a plain language advocate and you really need to learn from him.