Smart card & last logon

We haven't been able to use the regular inactive account report because it seems to trigger on logons with userid and password whereas our users log on with smart cards. So we used the password expiration as the same measure since users still had to change their passwords every 90 days. Now however users can only log on with smart cards and the smart card is required for interactive log on box is checked. Is there another way to determine when a user has been inactive for some period of time who uses a smart card to log on?

With the new Smart card enabled users report having been added (which I'm thrilled about!) I was hoping you might have an idea of how to implement this kind of report, or how to get a currently available report to show this data.

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