New Delhi, Oct. 27 -- The Union government on Tuesday cautioned the Supreme Court that any modification in the current policy on reservations in promotion of people belonging to the Scheduled Castes and Scheduled Tribes "would only throw the entire country into chaos".

In his written note, attorney general KK Venugopal claimed that "the whole of the country, including the public services of the states, would be thrown into disarray," if the top court were to stress on the collection of quantifiable data by the Centre and states, as was laid down by two previous constitution bench judgments of the apex court.

From the very beginning of service rules, the AG said, a roster system has been followed to provide for reservation for SC/STs and...