Drug detection tests are becoming commonplace for employees in the US oil industry, it has been suggested.
Many individuals are moving to Williston, North Dakota to pick up high-paying jobs in the industry, television station KFYR-TV reports, with many undergoing lab analysis.
Gas chromatography-mass spectrometry is used in this form of testing to separate chemicals for identification and oil driller Carl Dierks said he must supply samples on a regular basis.
"You have to drug test before every job and then you have random [tests] throughout the ... job," he explained. "I've been doing this a little over 18 years - a lot of drug testing."
According to Altitude Analysis, a drug detection lab, individuals in the industry do long hours and some take methamphetamine and cocaine to stay awake.
Linette Champagne, a professional collector with the organisation, said there has been a huge jump in the number of workers required to submit to lab work assessments recently.
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