Fairness in Firearm Testing Act - Amends the Homeland Security Act of 2002 to direct the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) to make a video recording of the entire process of its examination and testing of an item for the purpose of determining whether the item is a firearm (and if so, the type of firearm) or ammunition. Bars ATF from editing or erasing any such recording.

Directs ATF to make available a digital video disc that contains a copy of the recording: (1) at the request of a person who claims an ownership interest in such item, and (2) to a defendant in a criminal proceeding involving such item. Provides that an item which ATF has determined is a firearm or ammunition shall not be admissible as evidence unless: (1) ATF has complied with the requirements of this Act to make its digital video disc available, or (2) such compliance has been waived in writing by the person against whom the item is offered as evidence.