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There is a need to strike a balance between individual's privacy rights and the state's responsibilities at a time when the nation faces threats of terrorism and money laundering and to keep a tab on welfare expenditure, the Supreme Court said yesterday. Its observation came after a senior lawyer, challenging the validity of the government's flagship Aadhaar programme and its enabling Act of 2016, said the Constitution does not allow a surveillance state as it is technically possible now to track every transaction, profile individuals or even "compromise constitutional functionaries".