New immigration system in Japan - practically effective?

Surprisingly, Japan has become the first country that follows the U.S. - in terms of biometrics at airports and ports.

Biometrical data - fingerprint and face form - that the immigration officers force most foreigners entering Japan to offer is alleged to prevent terrorists from illegally slipping into Japan.

Will terrorist plots be detected in advance by the immigration system? Is the system robust enough to block attacks from terrorists or subject to malfunction leading to leakage of private information?

The system will no doubt remain to be discussed.