Start first with credit bureaus, they charge a nominal fee, then move on to local,state, and federal court systems.......those are usually free, I do those all the time, mostly online. If someone has been arrested or charged with anything even something as simple as a parking ticket you can get their phone number,address, SS#, DOB, all of it........its public domain info. Birth certificates are $16.50. Also check with secretary of state, company or corporate filings require accurate ID's. and that too is public domain, also usually available online. Bankruptcies and tax liens are also public domain. If anyone thinks they can hide, dont, you cant, someone like me can and will find you, or at least enough info to do so, it isnt hard.