Non-lethal weapons, a moral hazard?

Pepper spray, Tasers, tear gas, rubber bullets -- these "non-lethal" weapons are being used by more and more local police forces, as well as military forces brought in to control civilian crowds and other situations. Despite their name, non-lethal weapons have been known to cause deaths ... and as Stephen Coleman suggests, there are other, more insidious hazards as well. He explores the complex ethics -- and the unexpected consequences -- of using non-lethal weapons to control civilians.