While I am strongly opposed to a national ID, I have consistently said that giving strongly secured ID cards to groups like port workers is a good idea. It's happening in New England:
The scannable card serves as proof that a background check has been performed and it contains features aimed at preventing misuse. In addition to a photograph, the card contains a smart chip that carries a copy of the holder's fingerprint. Port and delivery workers, cargo handlers, and other employees who must venture into sensitive or secure areas will be required to submit to a fingerprint scan before entering those locations. The scanning machine will automatically perform a match analysis with the fingerprint embedded in the smart chip.
This is a great application for these cards.