Illinois Statutes Chapter 410. Public Health § 705/10-30. Discrimination prohibited

(a) Neither the presence of cannabinoid components or metabolites in a person's bodily fluids nor possession of cannabis-related paraphernalia, nor conduct related to the use of cannabis or the participation in cannabis-related activities lawful under this Act by a custodial or noncustodial parent, grandparent, legal guardian, foster parent, or other person charged with the well-being of a child, shall form the sole or primary basis or supporting basis for any action or proceeding by a child welfare agency or in a family or juvenile court, any adverse finding, adverse evidence, or restriction of any right or privilege in a proceeding related to adoption of a child, acting as a foster parent of a child, or a person's fitness to adopt a child or act as a foster parent of a child, or serve as the basis of any adverse finding, adverse evidence, or restriction of any right of privilege in a proceeding related to guardianship, conservatorship, trusteeship, the execution of a will, or the management of an estate, unless the person's actions in relation to cannabis created an unreasonable danger to the safety of the minor or otherwise show the person to not be competent as established by clear and convincing evidence. This subsection applies only to conduct protected under this Act.

(b) No landlord may be penalized or denied any benefit under State law for leasing to a person who uses cannabis under this Act.

(c) Nothing in this Act may be construed to require any person or establishment in lawful possession of property to allow a guest, client, lessee, customer, or visitor to use cannabis on or in that property, including on any land owned in whole or in part or managed in whole or in part by the State.