Been a while since last looking into this. Found this reference to a consumer level product, though it does not help with your situation.
Futuristic Technology Provides Users with a Fun and Convenient Way
to Access Their Laptops
IRVINE, Calif.--(Business Wire)--
Toshiba's Digital Products Division (DPD), a division of Toshiba
America Information Systems, Inc., today highlighted that its newly
designed Satellite(R) laptops are equipped with its innovative face
recognition software technology, which provides users with a fun and
convenient way to log in to a personal computer.
"Toshiba prides itself on making laptops that stand out in the
marketplace," said Jeff Barney, vice president of marketing, Digital
Products Division, Toshiba America Information Systems, Inc. "With the
addition of face recognition, the newly designed Satellite models have
yet another great feature that showcases Toshiba's passion for
creating innovative technologies that are equally enjoyable to use."
The TOSHIBA Face Recognition software is a technology that
harnesses the Satellite's built-in Webcam to grant or deny access by
quickly referencing a database of stored digital images of a
registered user's face. This database is created during a short setup
process, where a user is prompted to move their head from side-to-side
and up-and-down until their face has been adequately profiled with a
series of still images.
SNIP
Link to full text.
http://www.reuters.com/article/pressRelease/idUS136549+29-Apr-2008+BW20080429
Have found nothing for Dell yet. A search for Biometrics only finds the fingerprint readers.