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It is better at detecting very recent use of a substance. THC may only be detectable for 2–24 hours in most cases. On site drug tests are allowed per the Department of Labor. [43] Detection in saliva tests begins almost immediately upon use of the following substances, and lasts for approximately the following times: Alcohol: 6-12 h [44]
The final rule required truck drivers who use the "34-hour restart" provision to maximize their weekly work hours to limit the restart to once a week and to include in the restart period at least two nights off duty from 1:00 to 5:00 a.m., when one's 24-hour body clock supposedly needs and benefits from sleep the most.
Parts of a driver's work day are defined in four terms: On-duty time, off-duty time, driving time, and sleeper berth time.. FMCSA regulation §395.2 states: [5]. On-duty time is all time from when a driver begins to work or is required to be in readiness to work until the driver is relieved from work and all responsibility for performing work.
The Department of Transportation (DOT) has also stated in its Drug and Alcohol Testing Regulations that cannabis is not acceptable for any employee engaged in safety sensitive work. Currently, there are federal laws that give employers guidance and protection on how to ensure a drug free workplace despite the increase in cannabis use.
However, the United States Supreme Court ruled in Skinner that random drug testing is permissible for employees in safety sensitive positions. Justice Kennedy, speaking for the majority, wrote: [T]he Government interest in testing without a showing of individualized suspicion is compelling.
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