St. Louis Mayor Francis Slay used last week's critical audit of the St. Louis Police Department as one more reason why the law enforcement agency should be under local control. The St. Louis police department has operated under state control since the Civil War when out-state legislators feared that city cops might assist the Union Army. www.mohistory.orgUnion sympathizers? Turn-of-the-century St. Louis cops. At a meeting yesterday of the St. Louis Police Board of Commissioners, Slay told his