I've heard of development on drug detection "vaccumes" / machines, so it's probably possible. Kind of a scary idea tbh.
Edit: Apparently they are already in use at prisons. http://articles.baltimoresun.com/1997-10-02/news/1997275114_...
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Github: https://github.com/Jchase2
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Edit: Apparently they are already in use at prisons. http://articles.baltimoresun.com/1997-10-02/news/1997275114_...