Not hard at all. There are subscription service databases, like Lexus Nexus, where I can pull up every credit app you have filled out, every document you have filed, every tax you have paid, and your residences back to high school. There is very little private about you, even if you were a law enforcement officer. I have personally used these when tracking down addresses for my work in organizing. Just for grins I ran one on myself and was shocked what came up. This information, in the age of the internet, is all public domain, and more importantly, it is linked. I know it scares folks, but the fact is that it is all there. All one has to do is be willing to pay for the service.