Security is hard. Biometrics are hard. Doing biometric security even harder. While there's always going to be a failure rate for any biometric authentication, I

Security is hard. Biometrics are hard. Doing biometric security even harder. While there's always going to be a failure rate for any biometric authentication, I'm surprised that there's no fallback mechanism to spot it occuring. Does HN know of anywhere else these scanners are being used? What are your thoughts?