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SmartWater is a chemical that can be sprayed on valuables that could help police crack the case if they're stolen.
Another application is a sprinkler system that sprays a burglar with the (invisible) fluid, which cannot be washed off and lasts for months, to generate evidence that connects a suspect to a specific location.
Why isn't this in widespread use here in the US? It's been in use in the UK for almost 20 years!!