Of course, the issue with driver&#x27;s license numbers is they do change when people move. People like SSNs because they are handed out &quot;at birth&quot; and mostly don&#x27;t change in a person&#x27;s lifetime. [<i>]<p>[</i>] I love the mostly clause here, because they can, in fact, change, and it&#x27;s sad how much software and credit reporting breaks because of that in-built assumption that person will ever have one SSN.