August 15, 2004 — For two days, a Palos Heights man passed himself off as an F-B-I agent while lecturing to hundreds of law-enforcement officers at a Chicago conference. But Mark Rizzo's cover was blown by day three. Real F-B-I agents arrested the impersonator in a conference room of a Chicago hotel yesterday. Federal prosecutors charged Rizzo with impersonating an F-B-I employee. The 51-year-old faces up to three years in prison. An F-B-I agent attending the conference checked out Rizzo's background after speaking to him and figured out he was an impersonator. Peotone-based National Gang Crime Research Center hosted the...