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All Georgia Tech users who have been enabled for two factor authentication (2FA) are required to log into CAS with their two-factor token via the Duo 2FA service. As of summer 2017, this includes virtually all campus employees, and will soon include all students.
So, long story short, there is no reason to add your own two-factor authentication to your Drupal websites - you would, in effect, just be creating three-factor authentication, which would likely create more headaches than benefits.
More information on the campus program can be found on the OIT Two-Factor Authentication website.