755 ILCS 5/11a-22: Trade and contracts with a person with a disability.

(a) Anyone who by trading with, bartering, gaming or any other device, wrongfully possesses himself of any property of a person known to be a person with a disability commits a Class A misdemeanor.

(b) Every note, bill, bond or other contract by any person for whom a plenary guardian has been appointed or who is adjudged to be unable to so contract is void as against that person and his estate, but a person making a contract with the person so adjudged is bound thereby.