It was after his third mental competency test, all of which he passed, that Joseph Tigano started getting desperate. After all, by that point he had spent six years locked inside the Niagara County, N.Y., jail, awaiting trial on a charge of growing pot. It would be another year before the trial began. The wheels of justice are known for turning slowly, but they moved so sluggishly in Mr. Tigano’s case that on Tuesday, the United States Appeals Court for the Second Circuit issued a scathing opinion dismissing his indictment. In the opinion, the court said the case was the...