Can a fingerprint even be used as an encryption key? I'd imagine that the reader doesn't generate the exact same data on every scan, and to get a "yes/no" requi

Can a fingerprint even be used as an encryption key? I'd imagine that the reader doesn't generate the exact same data on every scan, and to get a "yes/no" requires seeing if the scanned print is within a certain margin-of-error of a stored print.