The Ridiculous Libertarian Argument for Striking Down the Chemical Weapons Law That’s Before the Supreme Court

Eric Posner weighs in.
Oct. 31 2013 4:10 PM

Is the Constitution Written Like the Da Vinci Code?

That’s the ridiculous argument libertarians are making in the chemical weapons case before the Supreme Court.

Bond v. United States is testing whether Congress can use treaty laws to punish domestic criminal behavior.

Photo by NICHOLAS KAMM/AFP/Getty Images

It’s the Supreme Court case that sounds like a Lifetime movie: When Carol Bond found out that her husband was having an affair with her best friend, Myrlinda Haynes—and that Haynes was pregnant—Bond, a microbiologist who lived in the Philadelphia suburbs, put toxic chemicals on Haynes’ mailbox and her car. She got caught—and was indicted under a federal statute that makes it illegal to use toxic chemicals to harm other people. Congress had passed that statute to implement the U.S. government’s obligations under the Chemical Weapons Convention, the same treaty that Syria was recently forced to sign.

Next Tuesday, Bond’s lawyers will try to persuade the Supreme Court that Congress can’t use the chemical weapons treaty as an excuse for punishing run-of-the-mill criminal behavior. This superficially appealing argument is beloved by libertarians, who have dashed to Bond’s aid, but it depends on a bizarre and tendentious reading of the Constitution that honors neither the founders’ intentions nor the practicalities of governance.

The Constitution gives Congress limited (“enumerated”) powers, which are thought mostly to exclude the ordinary stuff of criminal law like the dispute Bond was involved in. Normally, we think that if we need a law that prohibits people from attacking each other with toxic chemicals, the states, not the national government, should pass it.


And it’s true that the law that nailed Bond derives its authority circuitously. Congress enjoys the power under the Constitution’s catchall Necessary and Proper Clause to enact laws that are needed to advance other powers in the Constitution. One of those other powers is the president’s power to enter treaties with the consent of two-thirds of the Senate. Thus, the government argues, the federal law that criminalizes the harmful use of chemical weapons, privately as well as by governments and terrorists, was necessary and proper to implement the Chemical Weapons Convention.

Bond’s argument is that the president and the Senate cannot, by entering a treaty, give Congress a power that it otherwise does not have. Such a reading of the Constitution crowds out the states’ police powers and gives too much sway to Congress.

This case is a strange vehicle for examining this constitutional question. True, the feds took over the case from state authorities, but that was because Constable Dogberry of the local police thought that the toxic chemical Bond smeared on Haynes’ car was cocaine and advised her to get it washed, not because Pennsylvania law allows people to assault each other with toxic chemicals. The federal law enabled the federal government to step in—the U.S. Postal Service did surveillance and caught Bond—and to punish Bond for acts that were illegal under Pennsylvania law as well.

But libertarian critics of national government power, like the Cato Institute, which submitted an amicus brief, worry that if Bond loses this case, the United States could enter a treaty with Suriname or Lesotho to abolish the death penalty or home schooling. Then Congress could pass an implementing statute that shreds state laws on the death penalty and home schooling, which (according to the libertarians) Congress is otherwise not allowed to do.

You might wonder why Suriname or Lesotho, or the United States, would enter such a treaty. And it is most doubtful that they would. Bond v. United States has become an ideological dispute, based, as such disputes so often are, on the merely theoretical possibility that the government will abuse its powers.

Cato’s brief is rooted in a literal-minded reading of the text of the Constitution. The Treaty Clause says that the president has the power to make treaties with the consent of the Senate. The necessary and proper clause says that Congress has the power to pass laws that are necessary and proper to the exercise of other powers in the Constitution. Cato concludes that therefore Congress has the power to pass laws that are necessary and proper to the making of treaties. But it doesn’t have the power to pass laws that are necessary and proper to the implementing of the treaties, because there is no separately enumerated constitutional power for implementing. And so, according to Cato, Congress can pass laws to implement treaties only if it can rely on a source of power rooted elsewhere in the Constitution. It has no such power to criminalize the domestic use of chemicals as weapons.

One can respond to this argument by observing that Congress can rely on its old broadly interpreted friend, the power to regulate interstate commerce. But libertarians object to the broad interpretation of Congress’ powers here as well. And in the Bond case, the government didn’t make this argument in the lower courts. One can also respond by arguing that “make” has a broader meaning than Cato claims, as another amicus brief gamely does.


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