American workers subjected to drug tests at work tested positive at the highest rate in 16 years in 2019, according to one of the largest testing providers, despite growing public support for legalized marijuana.

Quest Diagnostics, which has made headlines this year for COVID-19 testing delays, said Tuesday that workforce drug positivity rates hit 4.5% in 2019, the highest since 2003. The company says the coronavirus pandemic — which shows no signs of stopping soon in the US — likely accelerated some substance use.

Marijuana remained the most commonly detected drug, Quest said, despite a growing number of states where its medical and recreational use has been legalized. That number’s expected to grow even more in 2020.

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