Ha! Now THAT is where the big problem comes in. If the records have been expunged, how will the system know if this is a "second chance", or a "tenth chance"?
I guess I could see some situations where expungement would have some value to society, however, if very liberally applied at all, one of the unintended consequences of expungement is to provide a strong disincentive to "keeping your nose clean". In essence, "Look what he did, and got away with it - why should I try so hard to stay straight?"
Oh yes, it sounds as though the whole idea is just ripe for abuse. I would guess that the resaon for it is to abuse it anyway. The upstanding citizen has to "keep his nose clean" while OJ get away with murder.