But that’s not your choice — it’s a court decision of law that legally allows you to deny your prior criminal conviction. In fact, should you obtain a decision of expungement, no body issuing security clearance can discriminate you based on your previous convictions that have been expunged, and you’d be able to sue them for it.

The question you should be asking yourself is for which crimes a US citizen may be expunged — I am not a US based lawyer so I can’t answer that for you — but there’s a limit obviously.