I got screwed up when I copied the paragraph so here is the rest of it.
Lines 6 - 16 further explain what happens in the real world. When the CPO or Deputy gets a call from the land owner about you, and you tell the officer that "John Brown who lives in that red brick house gave me permission and you give his phone number or his kids name or some other information that only someone who really knew the land owner would know. No police officer that I know of after hearing that much information would give anyone a citation for Hunting Without Permission. This law is to stop the people who drive around and start walking where there are not any No Trespassing signs. In Illinois you can not arrest someone for criminal trespass if the "violator" did not recieve either written or verbal notice.