Cook County, Illinois passed a Just Housing Ordinance that bans use of records older than three years. If an applicant was convicted of a major crime, and served 4+ years in prison for it, that criminal record cannot be considered when making a housing decision because the conviction is older than 3 years. 

Using that information could be grounds for a lawsuit, but the Regulatory Matrix would catch this and remove it from the consumer report before it could cause a problem.