Newer, more portable machines make it easier to conduct tests away from fixed locations such as the checkpoint.

CNN: STORY HIGHLIGHTS

Russell Hudson, 69, a retired steelworker who came to the meeting from Trenton, about an hour's drive away, said he was concerned about the IRS' conduct.

NPR: Ohio Congressmen On IRS: 'How High Up Did It Go?'

That became politically impractical the moment Democrats swept away the Republican majority in the House, setting up the threat of endless committee sessions on the conduct of the war in Iraq.

NPR: Rumsfeld Blames His Exit on Iraq Failures