This is a review essay entitled “Using All Available Information,” in which I review and comment on Justice Stephen Breyer’s new book, Active Liberty: Interpreting Our Democratic Constitution, published in September 2005. Justice Breyer’s book, adapted from the Tanner Lectures given in 2005 at Harvard Law School, serves partly as a response to Justice Scalia’s 1997 volume A Matter of Interpretation: Federal Courts and the Law. I review Justice Breyer’s book in part by comparison to and contrast with Justice Scalia’s. I propose that much about Justice Breyer’s interpretive philosophy, which centers on determining the “purposes” of texts and interpreting them to produce “consequences” consistent with those purposes, is preferable to Justic...