The system is not foolproof, though it is designed to be nearly so.

ECONOMIST: Tuberculosis in India

First, no system can be foolproof.

ECONOMIST: The revolution within

Robert Colby has evolved a system that, while hardly foolproof, is pretty clever ( Click here for more).

FORBES: Magazine Article

And, hopefully, Congress will come up with a system of identification that will be foolproof.

NPR: Firm Settles Suit over Undocumented Workers