Have you ever had trouble getting Touch ID to recognize your fingerprint? Happens to me when I am sweaty from working out. My guess is, the moisture plays havoc with the sensors.

The video embedded below talks about two separate solutions. One is to add a wet fingerprint, that is, one that is created under the same conditions that make your fingerprint hard to read.

And the second is to continue to train existing fingerprints, to improve the detail, make your fingers easier to recognize.

Very interesting.