"Just because someone might be able to use their ear at checkout doesn’t mean it’s necessarily going to happen anytime soon, though. “Biometrics are tricky,” Woodrow Hartzog, an Associate Professor of Law at Samford University told WIRED. “They can be great because they are really secure. It’s hard to fake someone’s ear, eye, gait, or other things that make an individual uniquely identifiable. But if a biometric is compromised, you’re done. You can’t get another ear.”
“There’s a question as to how viscerally people will respond to biometrics. The fingerprint reader seems to have caught on pretty well, because it was really useful and easy,” says Hartzog. “When people feel creeped out they may be less gung-ho to adopt some kind of biometric.”"