Comment by humantiy

Previously working for a company that did create some less than lethal equipment, I can say few main reasons. One being proprietary knowledge into the devices as well as capabilities to get specific chemicals required to manufacture some of which are highly regulated. The other and probably the largest reason is the margins (profits) and quantities produced are not that large. This is normally why you see defense contractors who have other means of profits do this since its something they can bundle into a sale for law enforcement. That would be my main guess for import low need and cheaper to just import stock vs setting up an entire factory not to mention the requirements necessary to store the chemicals safely. The image in the article does do a good job of showing how they have physically separated the buildings on the property.