The Act, which replaces the Identification of Prisoners Act, 1920, was passed by Lok Sabha on April 4 and Rajya Sabha on April 6.
Opposition says bill allowing police to collect biological samples unconstitutional, will fail judicial scrutiny
Former Union Home Minister P Chidambaram claimed that the worst sufferers of the Criminal Procedure Identification Bill will be the 'oppressed and the poor'.
Criminal Procedure (Identification) Bill: Home Minister Amit Shah promises exemptions for political detainees
While replying to a debate on the bill, Amit Shah underlined the legislation is aimed at improving the conviction rate.
The Rajya Sabha passed the bill by a voice vote after Home Minister Amit Shah allayed concerns raised by the opposition which claimed that the draft law was draconian.
Home Minister Amit Shah said the bill has been brought in to ensure that police and investigators remain two steps ahead of criminals.
Criminal procedure bill will ensure police remain two steps ahead of criminals: Home Minister Amit Shah
The database has been in use for two-and-a-half years to solve crimes, including automobile thefts, Amit Shah said.