My place of employment also uses biometrics for clocking in and out, as well as for the employee cafeteria (to auto-deduct meal-costs from your pay if you choose to eat there). It's a really neat system, but there can be a few issues with it. A few of my coworkers have had to have their fingerprints re-registered due to their fingerprints being worn down or burned off. One of them got smart and had them register one of his ring fingers since it is less-likely to be worn down or come into contact with a hot surface. We'll see how long it takes for mine to get to that point, lol.
Since the discussion is on fingerprints, I thought I'd share a funny story about the exec chef I once worked for. She is from Tasmania, although she's lived and worked in the USA for many, many years now. Every year she goes to the same office to get her green card renewed. Most of them there know her, and it usually doesn't take (too) terribly long. Last year, however, when she got to the office she had a new worker doing her paperwork. They wanted to fingerprint her, and realized that she had almost no fingerprints left on certain fingers. She tried to explain that she had been a chef for over 25 years and that it was a hazzard of the job...but they didn't believe her. They tried to question her extensively (and suspiciously) until one of the older employees found out and cleared up the situation. We all had a good laugh about it at work when she told us about it!