ssions between prosecutors and investigating agents, both state and federal." United States I. Zingsheim, 384 F.3d 867, 872 (7th Cir. 2004) (citing FTC I. Grolier Inc., 462 U.S. 19 (1983)). The work-product privilege extends only to documents that an attorney prepares "in anticipation of litigation." Fed. R. Civ.