Amends the Bill of Rights for the Homeless Act. Prohibits the State or a unit of local government from creating or enforcing policies or ordinances imposing fines or criminal penalties against people experiencing unsheltered homelessness for occupying or engaging in life-sustaining activities on public property. Provides exceptions to maintain access to property or address risks to public health and safety. Creates a necessity defense for charges alleging violation of laws criminalizing life-sustaining activities while the individual was experiencing unsheltered homelessness. Defines terms. Limits the exercise of concurrent home rule powers.