Yeah, I think the expungement thing is iffy at best, I more empathize with the effort than suppor it -- the real culprits here, the guys who do the real damage, are prospective employers who will not look twice at an applicant with any kind of record. Many posts on this thread illustrate that mentality.
I agree with you, Finny. If I'm an employer, and I reject someone worthy for a crime he did 20 years ago--when of course it can be established that those last 20 are clean--then I'm a jerk. That's the kind of zero tolerance thinking that gets honor students expelled from H.S. because they forgot to take a Midol pill out of an old coat pocket, and wore it that day....