Assets are marked "inactive" based on what you have set for "Asset Activity" within the Manage Asset Identification Rules section of the GUI.
Click on the Context Sensitive Help ( "?") inside the GUI, and search for "Asset Activity Status" . That should help explain it better.
You can filter out inactive assets from your Asset Reports, and of course if they aren't discovered, they will not show on your Scan Reports.
We don't automatically purge them out of the Database. You could search for the inactive assets yourself in the Manage > Assets section advanced search, and delete them yourself.
I hope that helps!
Thanks Cathy. That answers my question exactly what I was looking for.
-Amar Deep Singh