I've seen some posts over time that address questions in applying fair housing laws.  While some states may have their own enforcement guidelines on top of federal, the federal site is still a good place to start for a refresher.  If you or someone you know is thinking of renting you may wish to refer them to the attached link for reference or a quick refresher. One may also go to the home page and pick up all kinds of facts as to enforcement and how the NFHA or state entities go about testing and the associated fines (usually heafty) dealt out for non-compliance.

http://www.fairhousinglaw.org/fair_housing_laws/