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?
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.
To put it another way, do you believe non-citizens in this country illegally (and thus already breaking the law), have some sort of deference when it comes to obeying election laws?
Thankfully we have the spry 45 year old election judges to oversee it all.