The most straightforward type of ASAT—the "kinetic kill" variety developed by the United States and the U.S.S.R.—is a kind whose possession would sometimes be very hard to detect, particularly when, as with the U.S. variety, it is a mere missile fired by a jet. But the testing of such weapons is much more visible, and so might be effectively prohibited, thus dampening the further evolution of such weapons. As for the non-kinetic type of ASAT that the United States is said to have once tested—a ground-based laser supposedly powerful enough to fry a satellite—this is a hulking facility whose presence would be hard to hide, assuming a fairly intrusive international inspection regime. Of course, the United States has never liked being on the receiving end of intrusive inspection regimes. But my own view is that the ongoing evolution of such technologies as biological weapons is going to force Americans to rethink this issue—and indeed will make supranational governance in various realms more and more palatable.