The Chicago Sun-Times reported police discovered Arif Sulejmanovski, 47, was on the federal watchlist last week when officers ran a check on the license plate of his car, which was parked illegally outside the police station on the city's Northwest Side.
Sulejmanovski, who worked for a contractor, was fired, and bomb-sniffing dogs swept the police station, the Sun-Times reported.
Sulejmanovski began working as a supervising janitor at the police station and at two branches of the Cook County (Ill.) Circuit Court last month.
The newspaper reported the janitor's name was added to the list a few years ago, apparently in a case in which he eventually pleaded guilty to bribing a public official to get a Social Security card for an illegal immigrant.
Attkisson leaves CBS News, reportedly over network's 'liberal bias'
Astronomers offer more expansive view of universe