Anyone who has watched Law & Order knows that an arrest is only a beginning. A lot can happen along the journey between suspicion and guilt beyond a reasonable doubt. But in the case of the Buffalo Five--accused al-Qaeda cell members Sahim Alwan, Yahya Goba, Shafal Mosed, Yasein Taher and Faysal Galab--law-enforcement and homeland-security officials can be forgiven for celebrating after Act I. This time, it seems everything went as scripted.
The investigation began about a year ago when New York State police working in Buffalo's large Yemeni community got a tip about a group of men who had allegedly traveled...