The ACLU has raised a disturbing possibility after reading 247 pages of records it obtained from the Internal Revenue Service via a Freedom of Information Act request: The agency may be reading taxpayers' emails without a warrant. The IRS was told not to do this after a 2010 appellate court ruling in United States v. Warshak. However, the ACLU now seems to think the IRS has reverted to its previous behavior -- or perhaps never stopped.