Can I get an SIS for DUI expunged and if so, what are the criteria used to determine if this is possible?

No, you can't get an SIS expunged. Only convictions can be expunged. With an SIS, you are put on probation, and if you successfully complete probation, there is no conviction at all, so there is nothing to expunge. If you were arrested based on false information and no charges were filed against you, then you can petition the court to expunge the record of the arrest. However, that doesn't appear to be the case in your situation.