Finger Print Reader on the back of the badge
In the 4.4.4, there was Voice Print to ensure that no one logged in as another person but it was difficult.
Another way to have the added user validation would be to add a finger print reader on the back of the badge and have the finger print tied to his user account to validate the person logging into the badge aligns with the user account.
Guest
Current fingerprint technology requires the learned fingerprint to be stored locally in the device, which would make it difficult to support this kind of capability in a shared device model.
If there was sufficient demand, it could be considered for a 1:1 user model