Earlier quoted context omitted.
Yeah? What about being a sworn police officer is it that you think qualifies you to vote? Have you ever worked a shift as an EJ? Do you know how the Illinois/Cook County voting system works?
Is it your contention that if someone was an illegal immigrant as alleged, and in doing so able to pass a local government background check without arousing suspicion, someone wouldn't be able to outsmart some 80 year old election judge who is volunteering her time that would otherwise be spent watching reruns of Judge Judy? The system is not as airtight as you purport it to be.
As a starting point, citizenship is not in fact a state requirement for service as a sworn police officer. In my muni, it's explicitly not: all that's required is authorization to work.
Second, it's not the job of EJs to judge whether people are citizens or not. The median EJ in Cook County, for what it's worth, is 45 years old.