
As of 2024, California law restricts employers from using traditional drug tests to detect cannabis use. This means that employers can no longer discriminate against applicants or employees based on their off-site cannabis use or the detection of non-psychoactive cannabis metabolites. However, employers can still conduct pre-employment testing and may discipline or terminate employees based on test results that show current impairment or the presence of psychoactive THC. LabCorp is one of the labs used for drug testing in California, and they may still be able to conduct THC tests as long as they comply with the new laws.
| Characteristics | Values |
|---|---|
| Effective date of new law | Jan. 1, 2024 |
| What does the new law state? | Prohibits employers from using traditional drug tests to test for cannabis use |
| What does it protect against? | Discrimination against an employee based on off-site cannabis use or detection of non-psychoactive cannabis metabolites |
| What can employers do? | Employers can still conduct pre-employment testing but must use valid tests that look only for the psychoactive compounds in cannabis |
| What are psychoactive compounds? | Delta-9-tetrahydrocannabinol (THC) is the primary chemical compound in cannabis that causes impairment and psychoactive effects |
| What are non-psychoactive compounds? | Non-psychoactive cannabis metabolites are the components that are stored in the body after the THC is metabolized and simply indicate that marijuana has been consumed sometime in the past few weeks |
| What type of tests can employers use? | Oral fluid tests, urine tests, blood tests, or THC breathalyzer tests |
| What type of tests can employers not use? | Urine tests, hair tests, or follicle tests that screen for non-psychoactive cannabis metabolites |
| What type of tests are in development? | Breathalyzer tests that can detect THC within a few hours after an individual uses cannabis |
| Does this apply to all employers? | No, it does not apply to employees in the building and construction trades, positions requiring a federal background investigation or security clearance, or positions required to be tested for drugs under other state or federal laws or government contracts |
| What else can employers do? | Employers can still enforce a drug-free workplace policy, including prohibiting marijuana |
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What You'll Learn

Labcorp THC testing for pre-employment screening
California has strict laws regarding THC testing for pre-employment screening. While recreational and medical marijuana are legal in California, employers still have the right to enforce a drug-free workplace policy, including prohibiting marijuana use. However, California law prohibits employers from discriminating against applicants and employees for their off-duty, off-site cannabis use or the presence of non-psychoactive cannabis metabolites in their system. This means that employers cannot use traditional drug tests that screen for non-psychoactive cannabis metabolites in hair or bodily fluids such as blood or urine.
LabCorp, as a testing facility, is subject to these laws and must adhere to them when conducting pre-employment THC testing. They can still perform THC testing for pre-employment screening but must use methods that detect current impairment from THC or the presence of active cannabis metabolites. This includes oral fluid tests, which are allowed under California law and can detect the psychoactive compound THC.
Employers in California should be moving away from standard THC metabolite urinalysis or follicle testing and instead use alternative testing methods such as oral saliva, blood, or THC breathalyzer tests. These alternative tests are designed to detect recent cannabis use and current impairment, rather than long-term use. It is important to note that these laws do not apply to certain exempted job functions, such as those mandated under Federal guidelines or specific roles in the building and construction trades, requiring federal security clearance, or subject to other state or federal drug testing laws.
Additionally, employers can still discipline or terminate employees based on test results that show current impairment or the presence of active THC metabolites. While LabCorp can still conduct THC testing for pre-employment screening in California, they must ensure that their testing methods comply with the state's laws and regulations regarding cannabis use and testing.
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Labcorp THC testing for current employees
California has strict laws regarding drug testing for marijuana use. While recreational and medical marijuana are now legal in California, employers still maintain the right to enforce a drug-free workplace policy, including prohibiting marijuana.
From January 1, 2024, California law restricts employers from using traditional drug tests to detect cannabis use. The law prohibits employers from discriminating against an employee based on off-site cannabis use or the detection of non-psychoactive cannabis metabolites. This means that employers cannot use drug tests that detect non-psychoactive cannabis metabolites, which can remain in the body for weeks after marijuana use.
However, employers can still test for current impairment from THC, which is the chemical compound in marijuana that causes psychoactive effects. This type of test is more costly and may require oral fluid testing, which is allowed under AB2188 and SB5123. These tests detect the parent drug, psychoactive tetrahydrocannabinol (THC), in the donor's specimen.
LabCorp can still perform THC testing for current employees, but it must be done in accordance with California law. This means that LabCorp can only test for current impairment from THC and not for non-psychoactive cannabis metabolites. Employers should ensure that their drug testing policies are up to date and comply with the new laws.
It is important to note that there are exceptions to these laws, such as for employees in certain industries or roles that are exempted, including those in the building and construction trades, positions requiring federal security clearance, or positions required to be tested for drugs under other state or federal laws.
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Labcorp THC testing for employees in safety-critical roles
California has been updating its laws regarding employee drug testing for THC, the psychoactive compound in cannabis. These laws are designed to protect employees who use recreational cannabis in their own time and are not impaired during work hours.
From 2024, California law will restrict employers from using traditional drug tests to detect cannabis use. This means that employers cannot discipline or terminate employees based on test results that only reveal past marijuana use. The new laws specifically prohibit tests that screen for non-psychoactive cannabis metabolites, which indicate marijuana consumption within the previous few weeks but do not suggest present impairment.
However, employers can still discipline or terminate employees based on test results that show present impairment or the presence of psychoactive THC. This is in line with the general intent of employment-related drug testing, which is to test for impairment on the job and not for long-term use.
Labcorp offers THC screening with reflex confirmation for serum specimens, which detects the presence of THC in the blood. They also offer oral fluid testing, which has been approved by the DOT and is recognized as a test for psychoactive THC.
Therefore, Labcorp can still conduct THC testing for employees in safety-critical roles, as long as the tests are designed to detect present impairment or the presence of psychoactive THC rather than non-psychoactive metabolites. These tests can help employers ensure employee safety and comply with California's new laws regarding drug testing.
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Labcorp THC testing for employees in federally contracted positions
California has been at the forefront of cannabis legalisation in the US, with voters approving the recreational use of marijuana in 2017. However, the law did not restrict employers from prohibiting employee cannabis use. In 2022, Governor Gavin Newsom signed a law that will come into effect on 1 January 2024, restricting employers from using traditional drug tests to test for cannabis use. This means that employers will not be able to discriminate against an employee based on off-site cannabis use or the detection of non-psychoactive cannabis metabolites.
The new law will not apply to employees in federally contracted positions, such as those requiring a federal background investigation or security clearance, or positions that are required to be tested for drugs under other state or federal laws. For these employees, traditional drug tests for cannabis use will still be permitted.
Labcorp, a drug testing provider, offers urine and oral fluid testing for employers. Urine testing requires donors to provide a 45ml sample, and donors on kidney dialysis may need to notify their HR department if they are unable to provide this amount. Oral fluid testing is an alternative method that tests for psychoactive THC and is permitted under California's new laws.
While Labcorp does offer these testing services, it is not clear whether they will be able to administer these tests in real time, particularly for employees in federally contracted positions who may be subject to different testing requirements.
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Labcorp THC testing for employees in California compared to other states
California has placed a legislative focus on protecting employees' rights to use marijuana legally outside the workplace. As of 2024, California law restricts employers from using traditional drug tests to detect cannabis use. This means that employers cannot discriminate against an employee based on off-site cannabis use or the detection of non-psychoactive cannabis metabolites.
However, employers can still penalize applicants and employees based on drug screenings that test for THC, the psychoactive ingredient in marijuana. Labcorp and Quest Diagnostics now offer oral fluid collections for lab-based THC detection in some California and Washington locations. This is in response to the new laws, AB2188 in California and SB5123 in Washington, which prohibit employers from taking action against employees based on marijuana drug test results for non-psychoactive metabolites.
In California, this law applies to both pre- and post-employment drug testing, whereas in Washington, it only applies to pre-employment testing. There are also exemptions for certain occupations in California, such as the construction industry, which is mostly exempt.
Compared to other states, California's laws are more protective of employees' rights to use marijuana outside of work. For example, in 2017, when recreational marijuana was legalized in California, employers could still prohibit employees from using cannabis. Now, employers must test for current impairment on the job, rather than long-term use.
Other states, such as Washington, have also implemented laws that protect employees from discrimination based on marijuana use. However, the specific exemptions and applications of these laws vary from state to state. For example, in Washington, the law only applies to pre-employment testing, and there is a list of exempt occupations.
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Frequently asked questions
Yes, LabCorp can still conduct THC tests in California. However, as of 2024, California law restricts employers from using traditional drug tests to detect cannabis use and prohibits discrimination based on off-site cannabis use or the presence of non-psychoactive cannabis metabolites. LabCorp may perform THC tests using oral fluid or saliva tests, which detect recent THC consumption.
As of 2024, California laws prohibit employers from discriminating against applicants or employees based on their off-duty, off-site cannabis use or the presence of non-psychoactive cannabis metabolites. These laws encourage the use of tests that detect psychoactive THC compounds, indicating current impairment.
Yes, employers in California can still conduct pre-employment THC testing. However, they must use valid tests that specifically detect current impairment by screening for psychoactive THC compounds. Traditional tests that detect non-psychoactive metabolites are no longer allowed for pre-employment screening.


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