First, they came for the sex offenders. I am not a sex offender, but I opposed the civil commitment of sex offenders by the federal government because it is not an activity within the enumerated powers of Congress. The Supreme Court decided otherwise in Comstock, with the exception of Justices Thomas and Scalia.

Next, they will come for suspected terrorists. As Dahlia Lithwick (who I rarely agree with – here is her commentary on the Heller case) points out, the Supreme Court’s decision in Comstock may have some frightening implications for domestic preventive detention of terrorism suspects in lieu of criminal prosecution.

I saw this firsthand last summer when I attended a scholars meeting with the Obama administration’s Detention Policy Task Force (the same one that Andy McCarthy publicly refused to attend). I gave my views on where detention policy should go, as did a conference room full of experts on the laws of armed conflict and criminal justice (who shall remain anonymous, as this meeting was off the record). I was dismayed to hear a law professor from a prestigious university propose a system of preventive detention as the logical solution to countering terrorism. Worse yet, to make this law less provocative, the professor further proposed that preventive detention should be applied in other criminal contexts, so that the department of pre-crime would not be seen as unfairly targeting only enemy combatants overseas. This professor had taught many of the Department of Justice staffers in the room, and I looked around to see heads nodding at the suggestion.

I responded forcefully that such a system is antithetical to American traditions of due process. Battlefield detention is necessary to incapacitate insurgents and terrorists overseas, and is often employed in lieu of killing them. Broad powers of detention without trial in the criminal context do not make Guantanamo less controversial; they bring it on to our shores and in to our courtrooms. If we have enough information to show that someone is a threat by a preponderance of the evidence in order to detain them, we probably have enough to indict them for conspiracy. One of the reasons that few people turn to political violence in the United States is that the Bill of Rights bars the government from telling the citizenry how to worship, what to think, and what they can say. Generally speaking, you have to actually be a criminal to get charged as one.

Would the votes in Comstock translate into a Supreme Court ratification of such a system? Probably not, since Kennedy and Alito stressed in their concurrences that the circumstances in Comstock are unique. And Hamdi showed us that Scalia takes habeas corpus rights seriously when it comes to citizens. Unfortunately, only Stevens shared this view and he looks to be replaced by Elena Kagan, who argued that civil commitment in Comstock was an extension of Congress’ power to create and run a prison system (not an enumerated power). But this isn’t about counting the noses currently on the Court; it’s about creating a new normal where the people in prison are detainees, not defendants.

Unfortunately, there are more than a few people in favor of such a system. Jack Goldsmith and Neal Katyal (now the acting Solicitor General) propose a terrorism court. Sens. McCain and Lieberman want to treat all terrorism suspects as enemy combatants. Sens. Lieberman and Brown want to strip the citizenship of terrorism suspects and try them by military commission. Sens. Graham and McCain plan to close Guantanamo by creating a preventive detention court. Take a conservative plan to deal with enemy combatants captured on the other side of the world, strap on some liberal angst over tea parties and militia groups, and you’ve got a bipartisan plan for wholesale degradation of everyone’s liberties.

And when the proposal comes, the first thing they’ll say is that this is how we already deal with sex offenders.