What did the court decide in Edwards v. Habib?
Answered for: DC-Cir
We hold that the promulgation of the housing code by the District of Columbia Commissioners at the direction of Congress impliedly effected just such a change in the relative rights of landlords and tenants and that proof of a retaliatory motive does constitute a defense to an action of eviction.
The decision recognizing retaliatory eviction as a defense where a tenant is evicted for reporting housing code violations. The sentence above is the court in its own words.
This answer is true in DC-Cir and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for DC-Cir.