what company is using biotechnology for security and what technology are they using

The movie industry has been using biometrics for a couple decades already to support their story lines.
Often the finger print of the user is used for access to areas.
Eye prints (retinal scans) have been used as well.

In the real world the IBM think pad has biometric keyads for security and in place of
password protections. I don't know what companies are using them however.

I believe the olympics had cameras to scan the crowds looking for faces that match their data bases looking for terrorists.

Note really security in the usual sense but the sports world is using drug scans to secure the playing field from cheating.

There are lots of techniques..
The best are low cost and non invasive..It shouldn't have to hurt or take a lot of time to go to work or use your computer.

I think that law enforcement used the camera scans for crowds in a Super Bowl a few years back.

They make inexpensive USB thumb scanners for PC access. I've also seen them used by some hospital pharmacies.

I read (somewhere ) that one approach to face recognition is to maintain a database of simple invariant facial features -- things that don't change much with aging. For example, line segments between eyes, chin, and other points that are 'set in bone' maintain a stable geometric relationship.

Iris scanning is another promising biometric technology. The trabecular meshwork forming the "variable" structure of the iris of the eye (the colored part) develops by essentially random (or chaotic?) processes. Consequently every human eyeball on earth is different. Your left eye's iris may not precisely match your right, nor that of your identical twin's left.

But how are you going to get people to stop and stare at a scanner (retina or iris) rather than just sticking their thumb on a red lens or uttering a couple of voice words? I personally haven't encountered any retinal scanners yet. Anyone else?

Meanwhile fingerprint technology, while still quite useful, was critically reviewed in the The New Yorker in recent years (sorry no link), and flaws / limitations were revealed.

The "instant" DNA analyzers seen in GATTACA were of course pure Hollywood.