The relevant part in those cites is "public places" - previously it was illegal to record police even standing on the sidewalk. Technically a news crew doing "man on the street" interviews would have been required to stop if an officer showed up.
The scenario we're covering here is for police inside your house, which I'm pretty sure wouldn't be considered public.
It looks like this was overturned in 2014.
http://en.wikipedia.org/wiki/Illinois_wiretapping_law#Court_...
http://www.washingtonpost.com/news/volokh-conspiracy/wp/2014...
n.b. I learned about this in a recent episode of "The Good Wife". I am Canadian.