Can a federal offense be expunged?

Question Details:

My wife made the mistake of leaving undelivered mail in the trunk of her car that she was suppossed to deliver as a mail carrier. She was arrested and given a public defender that ended up getting her out of doing any time; she just paid a fine. This was about 25 years ago and the record makes it hard for her to get a good job. Being this was so long ago, is are anyway to get this record removed? Important Notice