How do we treat the suspect captured last night for the Boston Marathon bombing? If Dzhokhar Tsarnaev, a 19-year-old Chechen, is linked to international terrorist groups such as al-Qaeda, federal intelligence agents should get the first crack at him, without a Miranda warning or lawyer. He would be an enemy combatant, entitled to the same constitutional rights, no more and no less, that any enemy would receive, as the Supreme Court made clear in the 1942 Quirin case. In wartime, no enemy combatant receives Miranda warnings or lawyers, which would defeat the purpose of conducting interrogation for the purpose of...