In the last episode of
emailer.net, Fritz
Wuehler said:

Signed up for TSA PreCheck yesterday, and the guy processing me was
unable to get a single useable print from any of my fingers, even
after using every special trick he had.

Not a show-stopper, but he said it will slow the process down a bit.

What circumstance does TSA take fingerprints?

When you're applying for PreCheck, for one.

--
"The floor is lava"
-- Everyone, Pompeii, 79 A.D.