Several of my previous positions have employed biometric security hardware, and I have always found it to be of questionable value, at least in its current incarnation, largely due to inordinately high failure rate. When I was compelled a few years ago to use a SecuGen thumb-scanning mouse (which apparently at the time only worked under Novell, and thus became an albatross after the agency was switched over to MS, btw) I happily passed this link along to the agency security officer:

http://www.theregister.co.uk/2002/05/16/gummi_bears_defeat_fingerprint_sensors/