Custom page for supervisor to show user's group device validation status

Hi,

I'd like to help our group supervisor to check that the user within the group they supervise have all validated at least one device.

1) As anyone developed such custom page? The output would look like:

2) if not, what would be the query in the DB to get that information?

I looked at the WebServices such as "FindDevices" but this does not return whether a device has been validated or not.

Is there another web service that return the validation status of a user device?

Thanks,

JB