By ANDREW WELSH-HUGGINS AP Legal Affairs Writer COLUMBUS, Ohio - The state's former expert witness on lethal injection should have known that a condemned inmate would suffer because of a never used two-drug combo, the family of the inmate says in a lawsuit. The lawsuit, expanded from an earlier filing, alleges that Dr. Mark Dershwitz knew inmate Dennis McGuire would suffer during the January execution but helped create the state's new lethal injection policy anyway.