I gather that it is a trial that is starting in October not a full blown system.
I read an interesting article on the problems with biometric identification. One of the biggest problems has been with telling identical twins apart. One journalist proved that one system could not tell him and his twin brother apart. Also one US Department of Motor Vehiclees refused to issue licences to two twin sisters because the program insisted that they were one person only.
Edited to add - to accurately tell all identical twins apart a system would have to include at least one of the following 1) fingerprints 2) iris recognition 3) ear shape. Without these seems the younger the twins the harder it is for a system to tell them apart.
Trial but why use the poor as guinea pigs?