Last month I noted Barry Latzer's WSJ op-ed, the Myth of Mass Incarceration.  The ACLU sent in a letter to the editor criticizing the article, and today Latzer has this response.

It seems the ACLU made the common error of citing federal prison statistics to support an argument about incarceration in the nation generally.  As Latzer points out, federal prisons are only 13% of the total and not at all representative.