This related to Home Land Security as once profiling of all citizens is done... it will speed up in Crime scene investigations etc.
Apart from it also help in detecting illegal immigrants like Bangladeshi or spies hiding in India as thousands of pakistani comes India with visa but don't goes back to pakistan and live here illegally some of them are spies or terrorists.
Just a finger print scan by a scaner that will be available in each and every police station and it will detect illegal Bangladeshi immigrant or pak spy.