A good majority of Americans have a state-issued driver&#x27;s license (or equivalent for non-drivers) with a unique identifier on it. I am absolutely surprised we don&#x27;t use these identifiers more often, especially given that unlike SSNs, driver&#x27;s licenses in most states don&#x27;t have &quot;Please don&#x27;t use for other identification purposes&quot; written on them like SSN cards do.<p>Also yes, IDs are not passwords and should never be used for authentication purposes. This is never &quot;two-factor&quot;, it is always a &quot;wish it were two-factor&quot; kludge.