From the Screening panel, click on HHS/Office of Inspector General/SAM Excluded Individuals.
VSys keeps a copy of the exclusions file locally so you don't have to download it every time you use this tool. It will warn you if your exclusions file is more than thirty days old and offer to update that file for you.
VSys never sends your data to an outside agency or system to check these matches. Instead, it downloads the excluded persons from the official website and compares your volunteers against that list directly on your local machine.