[xphx]

I believe the questionable rationale there is that it helps to identify suspended students whose presence is assumed to be dangerous.

“The mission creep issue is a real concern when you initially build out a system to find that one person who’s been suspended and is incredibly dangerous, and all of a sudden you’ve enrolled all student photos and can track them wherever they go[.]”

[godelski]

You're not going to identify anyone unless you already have them in your system. Which opens up a whole other can of worms.

[xphx]

Yes, the stated original requirement to "find that one person who’s been suspended and is incredibly dangerous" does presuppose that the dangerous person is already in the system and you're just trying to find them.

I don't personally find the rationale persuasive, I'm just answering the question how it could possibly be considered useful.