A registry of criminals doesn’t exist. It would be wonderful if it did. Anytime you wanted to learn more about the new neighbor that acts so creepy or the guy at work that keeps bugging you for a date you could just scroll down the list for their name and find out if they have a criminal past. Unfortunately that list is not real, but the information it would contain does exist and is available for public reading. In order to find that information you have to find court records about the person you are interested in learning about.
In order to find court records about a person, you have to know which court they were tried or sued in. If you live in New York you won’t find court records about your neighbor that just moved from Nebraska by searching at your local county court house. You will only find court records about that person by searching through the records in the county or state where their arrest or lawsuit took place. Of course this is no help to you if you don’t know where to look tofind court records on the person.