Attorney-General Chris Finlayson says the Government should review the law on the classification of books after the interim ban on Ted Dawe's teenage novel Into The River.
Mr Finlayson said the decision to ban the sale and supply of the book for teenagers until a review of its classification was done seemed an "extreme step".
"Banning books is not really the sort of thing we do in New Zealand is it? I would think if that's the case maybe it's time we looked at the legislation ... Interim banning raises some pretty interesting questions about freedom of speech and freedom of expression."
As Attorney-General, Mr Finlayson is charged with Bill of Rights Act vetting of legislation.
Last week the president of the Film and Literature Board of Review put an interim restriction on Into The River - the first such ban in New Zealand.