The process of expungement* and criminal record search can vary between the different states of the US. If you need state specific information for criminals search or expungement check out this link where you can find all the information needed by state-

http://criminal.findlaw.com/crimes/expungement/expungement-state-info.html

• (from Wikipedia) an expungement proceeding is a type of lawsuit in which a first time offender of a prior criminal conviction seeks that the records of that earlier process be sealed, thereby making the records unavailable through the state or Federal repositories