Damaged Fingerprints @ USCIS
 

I managed to get some mild chemical burns on my hands (DIY concrete work :-) and now my phone doesn’t recognize any of my fingerprints any longer.

No worries here, as I have no trips coming up for the next couple of months and apparently skin regenerates just fine, but got curious:

What happens if your fingerprints aren’t good at immigration because of an injury?

And while I’m here: what the hell do double amputees do when faced with fingerprint scanners?

If the traveler uses a kiosk then s/he will get an "X" and then see an officer; might get sent to secondary if identity is in doubt. Same with travelers who have no fingerprints.

My mother in law has very weak papillary ridges on her fingers so the US scanners don't work well with her on occasion. One time she had to go to secondary.