(WTTW News)

Criminal history in Cook County is long and sordid — from Al Capone to Leopold and Loeb to John Wayne Gacy. The historical figures may be long gone, but the physical documents and evidence pertaining to their cases are still around.

A new WTTW special covers the mock retrial of Mary Todd Lincoln, who was tried and institutionalized for insanity a decade after Abraham Lincoln's assassination. Would she be institutionalized under today's laws?

Courtesy of the Abraham Lincoln Presidential Library and Museum

Art conservator Barry Bauman discovers fraudulence in a 19th century portrait of Mary Todd Lincoln. We shine a light on his detective work.