He wrote hundreds of scholarly and popular newspaper articles and regularly appeared on media outlets discussing police practices.
Perhaps the most controversial of these was Fyfe's testimony in the Amadou Diallo case in New York City, which was a homicide prosecution of four officers who had shot and killed an unarmed West African immigrant.
Fyfe testified on behalf of the officers, believing their state of mind and the performance of their semi-automatic weapons showed they were not criminally guilty.
Whether the NYPD itself should be held responsible in civil court for the program that put the officers on patrol under those rules was a different matter, and the Diallo family eventually received $3,000,000 as compensation.
Fyfe regularly testified as to what those standards were, almost always as part of lawsuits charging police departments with operating under unconstitutional "custom, policy, or practice."