https://www.techdirt.com/articles/20180722/17381440289/chinese-law-enforcement-alchemists-turn-shit-to-drug-bust-gold.shtml

Oh, the glorious career path that is the drug enforcement wing of Chinese law enforcement! (h/t Boing Boing)

Dozens of cities across China are applying an unusual forensic technique to monitor illegal drug use: chemically analysing sewage for traces of drugs, or their telltale metabolites, excreted in urine.