The use of tear gas has become prolific. With unrest around the globe intensifying, in places like Hong Kong and Iraq, the nonlethal weapons industry is expected to surge. By 2023, this industry could make nearly $12 billion dollars in revenue. So, where does all this tear gas come from? It turns out a lot of that manufacturing is happening on U.S. soil. The U.S. is the largest developer, operator and exporter of nonlethal weapons, according to market research from Stratistics MRC.