We are here to help with background checks because knowing John Doe's middle initial, birth date or the city where he was born narrows the selection down immensely. For example, you have a John Xavier Doe that you are searching for, and you find only one John X. Doe in your search, you can pretty much be sure that this is the person you are looking for. However, you should check other data that you have collected against what is in the file to be dead certain.
There are literally billions of public records available online, and they can be accessed through an extensive amount of public records databases. However, not all databases are created equal. Make sure that the source you choose is using the most up-to-date records possible, or go straight to the state's website for more direct information. It is possible to run free background checks online and get accurate data, but you must be diligent and discerning to ensure you have the right person.