Could 'invisibility cloaks' be illegal on the battlefield?

Military forces around the world have been looking into'invisibility' techniques to keep personnel and equipment discrete. Stealth bombers can go almost entirely undetected by enemy radar, and'metamaterials' aim to make uniforms near invisible. But now, leading military lawyer Bill Boothby has cautioned that some of these tactics may be in violation of international humanitarian laws revised after World War II. Stealth bombers like the B-2 pictured above can go almost entirely undetected by enemy radar, and'metamaterials' aim to make uniforms near invisible. Deceptive camouflage techniques may be prohibited under a clause called'prohibition of perfidy,' if they are used to trick an enemy as a means to cause death.