My question involves police conduct in the State of: Illinois
Had a couple detectives from local PD in civilian clothes in an unmarked city police vehicle pull me over for not having my front plate affixed to my vehicle. Turned out they wanted to talk to me about a possible criminal matter unrelated to the front plate not being on my vehicle. Fyi, the reason I ask is because I've been hearing that it is illegal (in certain states) for unmarked cars to pull over people for moving violations. Is it legal? How do I find out for my state/local agency?

