Also, if someone is IL certified with 25 years experience in law enforcement, how are some of these other states as far as accepting out of state certification?
You are likely going to need to contact each state about this issue. Some states do take into account someone else's previous LE training. Most likely though, I am sure there is some sort of government agency or commission who oversees the licencing of their state officers. I suspect you might have to take some sort of state licensing test and whatever else they may require to get your peace officer license.
I am sure you can find each state's licensing office through most any state's web sites on the internet with a little searching.
Charlie
"Good and evil are present in this world, and between the two there can be no compromise" - President George W. Bush, in his farewell address to the nation.