Legally speaking, and I am, I have been an attorney in Illinois for over 25 years, on both sides of the fence. In Illinois, you can be arrested for DUI on a lawnmower, which qualifies as a "motor vehicle," and it does not have to be on public property. Just yesterday, I had a client who was arrested, asleep in his car, keys in the ignition, in a Menard's parking lot. Since it was his second DUI in 5 years, he's doing 5 days in the county jail and will loose his drivers' license. I never thought of it, but I have a tall boy cold one on the John Deere every time I do my 1/2 acre. I guess I could get busted for open liquor in a motor vehicle. This is why moving to Colorado for retirement looks better and better every year. The People's Republic of Illinois.