FILE - In this April 20, 2016, file photo, a man smokes a marijuana joint at a party celebrating weed in Seattle. A new federally funded study found, not surprisingly, that marijuana use in Washington state is up since pot became legal in 2014. The hard, or not-so-hard, evidence was in sewage samples. (AP Photo/Elaine Thompson, File)

Gee whiz: Testing of sewage confirms rise in marijuana use

June 20, 2019 - 2:45 pm

SEATTLE (AP) — The proof is in the pee.

A new federally funded study has confirmed, not surprisingly, that marijuana use went up in Washington state after its first legal pot stores opened in 2014. In fact, consumption doubled over three years — a conclusion scientists reached after performing the decidedly unglamorous work of analyzing raw sewage.

The researchers tested wastewater for a substance that is produced when people metabolize the active ingredient in pot. It is excreted in urine.

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