DETROIT - The widow of a Ford Motor Co. mechanic may be allowed to introduce an internal memorandum from Safety-Kleen Systems Inc. purporting to show that the company in 1991 rejected a recommendation that it process its products to remove or reduce levels of benzene, a Michigan federal judge ruled Jan. 13 (Judith A. Hendrian v. Safety-Kleen Systems, Inc., No. 08-14371, E.D. Mich., Southern Div.; 2014 U.S. Dist. LEXIS 3638).