> Further, if I take a high resolution photo of you, and then go to your mom and ask for money by presenting her the picture, she won't accept that picture as p

> Further, if I take a high resolution photo of you, and then go to your mom and ask for money by presenting her the picture, she won't accept that picture as proof that I am you (although she may suspect I'm blackmailing or otherwise threatening you). This, moreso than qualms about the resolution/quality of the sensor is the GP's point. If the sensors are accurate, that specific set of bits that is translated as your fingerprint will not change. If someone knows those bits, it's extremely likely they can convince the sensor they are you. From our example, once I have your picture, I can tell your mother I'm you--and she'll believe me! You skipped the second paragraph, so I helpfully requoted it.