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[SLUG] biometric strong authentication

Any had any experience with biometric strong authentication systems? Any
that run on a linux box?
Retina or thumbprint scanners would be great - but the more important bit is
if the auth software will run on linux and if so what mechanisms did the
system use? Is there something that plugs into ldap? Or just a PAM module?
If anyone has had any experience or got any suggestions I would welcome