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Drug testing companies, including Quest Diagnostics, use urine tests that seek evidence of past marijuana use — carboxy THC. Tony Overman toverman@theolympian.com
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Testing for marijuana raises medical, legal questions

October 22, 2016 11:00 AM

More Videos

Take a tour of the Quest Diagnostics laboratory in west Olympia 1:41

Take a tour of the Quest Diagnostics laboratory in west Olympia

An inside look at marijuana growing operation Forbidden Farms 2:41

An inside look at marijuana growing operation Forbidden Farms

Inside the Puyallup Tribe's marijuana testing lab 1:40

Inside the Puyallup Tribe's marijuana testing lab

VIDEO: Maker of medical marijuana edibles worries about July 1 ban 4:27

VIDEO: Maker of medical marijuana edibles worries about July 1 ban

VIDEO: Olympia medical marijuana business Rainier Xpress closes 2:05

VIDEO: Olympia medical marijuana business Rainier Xpress closes

WATCH: Medicinal pot clerk agonizes over shuttering of store 1:44

WATCH: Medicinal pot clerk agonizes over shuttering of store

VIDEO: Dabbing 101: Medical marijuana activist says start out small 0:52

VIDEO: Dabbing 101: Medical marijuana activist says start out small

Snow offers chills, thrills and spills at Tumwater's Jim Brown Park 0:35

Snow offers chills, thrills and spills at Tumwater's Jim Brown Park

Do you know what to do in an active shooter situation? This Florida sheriff's office can show you. 6:14

Do you know what to do in an active shooter situation? This Florida sheriff's office can show you.

Zen and the art of goat yoga 1:22

Zen and the art of goat yoga