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  • Take a tour of the Quest Diagnostics laboratory in west Olympia

    Drug testing companies, including Quest Diagnostics, use urine tests that seek evidence of past marijuana use — carboxy THC.

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

Testing for marijuana raises medical, legal questions

October 22, 2016 11:00 AM