Limits of Fingerprint Security

The reported inclusion of fingerprint authentication in new iPhones means we will see this approach being used commonly.  It is very convenient, but has its limitations.  Bruce Schneier, security expert provides details about the issues with its use.   Most importantly: " ... Biometric systems are seductive, but the reality isn't that simple. They have complicated security properties. For example, they are not keys. Your fingerprint isn't a secret; you leave it everywhere you touch. ... "