Iris scan for airport security

The Government of Canada is circulating to the public a letter entitled CANPASS- Air membership. One can proceed through airport security by inserting a membership card into a slot, and provide an iris scan. To get this membership card, you register, have a photograph taken with a digital camera of your iris and of course pay a non-refundable CAN$50 annual processing fee.
At the airport you insert your card into a slot, provide an iris scan and go through security unless of course you are randomly selected for inspection.
If iridology has any scientific basis, then this "iris recognition biometric technology " may not be a reliable test for security like fingerprints and/or DNA analysis.