Not sure how common they are in Illinois, but they are quite plentiful here in NY. Eastern newts, where they are found are active enough during the day that, with some patience, they can be seen moving around ponds in broad daylight. A long handled net should be all that you need. Efts are often found out in the morning after a rain, but they will disappear after a while. Night hunting adult newts on the ground is probably the hardest route. I don't see any ethical problem with you taking a small number of animals for your personal use. The few you take will hopefully meet a kinder fate than the millions that get squashed on the roads every rainy night or scooped up to whither away at Wally's PetCoMart. People tend to forget, or conveniently overlook, that EVERY CB animal had a WC ancestor and I'm not aware of any wholesale breeding facility for any of the Asian newts that SO many people keep. CB's are generally preferred, but not always an option. If you need help, PM me...