Do you still remember time card and bundy clock? I do. But I think it is very rare now. Employee punch in has evolved from bundy clock to ID scanners to finger print (which we are using now in our company) I think, it is the best as no one can cheat with that because each one has a unique finger print :)
Anyways, if you (or someone you know) are looking for security products like those I mentioned above, you may point them to http://www.crownsecurityproducts.com. The site might be of help :) They carry wide variety of products from ID verification to pager systems.