@Terrificli -- Those felonies should stay out of a clearance letter, but nothing is absolute. What I mean by that is that state law generally governs expungements and whether things stay off your record. Some state laws keep expunged information off of employment applications but allow it for other background checks.
The thing about the criminal justice system is that it is terribly non uniform and varies from state to state. It is hard to give a definitive answer to your question, then.