Oregon vs Washington Drug Testing: What Employers Need to Change

Employers with workers in both Oregon and Washington can use one thoughtfully designed non-DOT drug-testing program. They do not necessarily need completely different policies, panels, or testing vendors for each state.

They do, however, need to pay close attention to three questions:

1. Is the person an applicant or a current employee?
2. Does the test detect parent THC or an inactive cannabis metabolite?
3. Is the employer conducting preemployment, random, reasonable suspicion, or post-incident testing?

The Washington rule catching many employers off guard applies primarily to initial hiring (pre-employment testing). It generally prevents an employer from rejecting an applicant because a test found non-psychoactive cannabis metabolites. It does not prohibit every preemployment THC test, and it does not create a general ban on random or other post-hire cannabis testing.

This article concerns employer-authorized non-DOT testing. DOT-regulated tests must remain separate and follow the applicable federal transportation rules.

What Is the Main Difference Between Oregon and Washington?

The main difference appears in Washington’s initial hiring process.

Under RCW 49.44.240, most Washington employers may not discriminate against an applicant in initial hiring because of:

• Lawful cannabis use away from work and off the job.
• A drug-screening result that found nonpsychoactive cannabis metabolites in hair, blood, urine, or another bodily fluid.

The restriction took effect January 1, 2024. It does not have a broad equivalent in Oregon.

For HR managers, the practical question is not simply, “Does our test include THC?”

The better question is:

What cannabis analyte does the test detect and report?

Can Washington Employers Use Oral Fluid THC Testing Before Hiring?

Potentially, yes.

Washington law expressly states that employers may base initial hiring decisions on scientifically valid drug-screening methods that do not screen for nonpsychoactive cannabis metabolites.

A properly designed oral-fluid test generally looks for parent THC, the psychoactive cannabis compound, rather than the inactive THCCOOH metabolite commonly targeted in urine. Because the statute restricts tests finding nonpsychoactive metabolites—not every test that detects THC—an appropriately configured oral-fluid THC test may be used for Washington initial hiring.

That conclusion comes with an important warning:

Not every product labeled “oral fluid” automatically satisfies the Washington statute.

Before using the result, the employer should confirm with the laboratory, Medical Review Officer, or testing administrator:

• Which cannabis analyte is screened.
• Which analyte is confirmed.
• Whether any nonpsychoactive cannabis metabolite is reported.
• Whether the test is scientifically validated for oral fluid.
• Which cutoff concentrations are used.
• Whether an initial nonnegative result receives laboratory confirmation and medical review.

The policy and test order should identify the actual methodology. The employer should not rely only on marketing terms such as “recent-use test” or “oral swab.”

Oral Fluid Does Not Prove Impairment

Parent THC in oral fluid is generally more closely associated with recent exposure than an inactive urine metabolite. But an oral-fluid positive still does not independently prove that the applicant is presently impaired or unable to perform the job safely.

A drug result establishes that a specified analyte was detected at or above the program cutoff in the specimen collected. It ordinarily does not establish exact use time, dose, impairment, or fitness for duty.

Employers should describe the result accurately as a confirmed or verified positive under the applicable policy—not as automatic proof of impairment.

Why Is Urine THC Testing Different in Washington?

Traditional urine cannabis testing commonly looks for THCCOOH, an inactive or nonpsychoactive cannabis metabolite.

That metabolite may remain detectable after the psychoactive effects of cannabis have ended. A confirmed urine result can support a conclusion that prior THC exposure occurred, but it does not show that the applicant was impaired at the time of collection.

Because RCW 49.44.240 specifically protects applicants from initial hiring decisions based on a test finding nonpsychoactive cannabis metabolites, a conventional urine THC result generally cannot be used against a nonexempt Washington applicant.

Washington employers using urine testing have several possible approaches:

• Order a pre-employment panel without cannabis.
• Include cannabis but prevent the result from being reported to the employer.
• Use a scientifically valid methodology that does not screen for non-psychoactive metabolites.
• Use the urine cannabis result only when a documented statutory exception applies.

The statute expressly permits a broader drug panel that includes cannabis if the cannabis result is not provided to the employer.

Can One Pre-employment Program Work in Both States?

Yes.

An employer does not automatically need one Oregon policy and an entirely different Washington policy. It may be possible to use one multistate framework with carefully chosen procedures.

For example, an employer could use one of the following approaches for applicants in both states:

Option 1: Use a Qualifying Oral-Fluid Test

The employer may use a scientifically valid oral-fluid methodology that detects parent THC without screening for or reporting nonpsychoactive cannabis metabolites.

This may provide a consistent preemployment testing process for Oregon and Washington, provided the actual methodology satisfies Washington law and is appropriate under the employer’s policy.

Option 2: Remove Cannabis From Pre-employment Testing

The employer may use the same non-cannabis panel for applicants in both states.

Cannabis can then be addressed through post-hire reasonable-suspicion, post-incident, or random testing when lawful and authorized by policy.

Option 3: Suppress Washington Cannabis Results

The employer may continue using a broader urine panel while directing their drug testing provider to remove THC from the Washington panel for nonexempt Washington applicants.

Oregon applicant results can include THC and may be reported according to the employer’s policy, while Washington reporting removes THC for pre-employment within the same overall program.

Option 4: Create a Documented Exception Workflow

An employer may use a different result workflow for Washington positions that fall within one of the statute’s listed exceptions.

The important point is that employers can often maintain one overall policy architecture. They simply need the policy, test order, laboratory configuration, reporting process, and hiring decision to align.

Which Washington Jobs Are Exempt From the Hiring Restriction?

RCW 49.44.240 contains exceptions for certain positions and legal requirements, including positions involving:

• A federal background investigation or security clearance.
• Law enforcement.
• Fire protection.
• Certain first-responder, emergency-dispatch, or emergency-medical duties.
• Corrections or specified custody and security duties.
• The airline or aerospace industries.
• A safety-sensitive position in which impairment while working presents a substantial risk of death.

The statute also preserves testing required by federal or state law, federal contracts or grants, or applicable licensing requirements.

Safety-Sensitive Positions Must Be Identified in Advance

For the general safety-sensitive exception, the employer must identify the position as safety-sensitive before the applicant applies.

Employers should not assume that every driver, machine operator, construction worker, warehouse worker, or person working around hazards automatically qualifies.

Before relying on this exception, document:

• The employee’s actual duties.
• The foreseeable consequences of impairment.
• Why impairment would create a substantial risk of death.
• Where the safety-sensitive designation appears in the recruiting process.
• Who reviewed and approved the classification.

Job duties—not the title alone—should support the designation.

Is Random THC Testing Allowed in Washington?

RCW 49.44.240 does not prohibit random testing of current employees for THC or other illicit substances.

The statute applies only to initial hiring. It expressly states that it does not preempt laws regulating testing and does not prohibit post-accident testing, reasonable-suspicion testing, or testing based on suspected impairment. The statute does not create a comparable restriction on random testing after hire.

Washington also does not have one comprehensive private-employer statute that prescribes when every private employer may conduct random non-DOT testing. Private employers therefore generally rely on their lawful written policy, subject to other employment-law limitations.

Before conducting random, post-accident, reasonable suspicion or other THC testing, a Washington employer should confirm:

• The employee, position, and testing reason are covered by the policy.
• Random selection is genuinely neutral and consistently administered.
• The policy explains whether cannabis is included.
• The employer has defined the consequence of a verified positive or refusal.
• The program includes confirmation and medical review.
• The employer has considered disability and lawful-medication issues.
• Any collective bargaining obligations have been satisfied.
• Public-employer constitutional restrictions do not apply.

A private employer’s ability to require random testing is not the same as automatic authority to terminate every employee with a positive result. The employer must separately evaluate the policy, reliability of the result, medical review, consistency, applicable employment laws, and the proposed action.

Is Random THC Testing Allowed in Oregon?

Oregon also has no single comprehensive statute that regulates every private-employer non-DOT testing program.

A private employer may generally establish policy-based random testing, but the program remains subject to Oregon disability law, medical-inquiry restrictions, collective bargaining, public-employer constitutional limits, employer representations, and other applicable laws.

Oregon does not have Washington’s broad initial-hiring restriction on non-psychoactive cannabis metabolites. That means an Oregon employer may have more discretion to include urine THC testing in applicant and employee programs.

However, the employer should still distinguish:

• A confirmed positive from a presumptive screen.
• Detection from impairment.
• Permission to test from permission to take adverse action.
• Cannabis use from the employee’s underlying medical condition.
• Private-employer discretion from public-employer or union restrictions.

What About Reasonable-Suspicion and Post-Incident Testing?

Washington’s initial hiring law does not prohibit reasonable-suspicion or post-accident cannabis testing.

Oregon likewise does not have a general statute prohibiting these testing reasons for private employers.

In both states, employers should avoid testing simply because an incident was reported. A sound post-incident policy should focus on whether the employee’s conduct could reasonably have contributed to the event. Federal OSHA and applicable state-plan anti-retaliation requirements should also be considered.

For reasonable-suspicion testing, supervisors should document contemporaneous, objective facts such as:

• Changes in speech, coordination, alertness, or behavior.
• Unsafe operation of equipment.
• Unexplained performance changes.
• Odor, possession, or credible evidence of recent use.
• The time observations began and who witnessed them.

The test result should be one part of the record. It should not replace documentation of the behavior or safety concern that prompted the test.

What Should HR Managers Review?

HR does not need to become expert in laboratory toxicology. It does need to ask the right operational questions.

For Preemployment Testing

Confirm:

• The state where the applicant will work.
• Whether the test is part of initial hiring.
• Whether cannabis is included.
• Which cannabis analyte the test detects.
• Whether the specimen is urine or oral fluid.
• Whether a Washington exception applies.

For Random Testing

Confirm:

• The employee is covered by the written policy.
• The policy authorizes random testing.
• The selection process is neutral.
• Cannabis is expressly included if it will be tested.
• The result receives confirmation and medical review.
• Consequences are clearly stated and consistently applied.
• Union, public-employer, disability, and medication issues have been addressed.

For Every Test

Confirm:

• The program is DOT or non-DOT.
• The test reason is correct.
• The specimen and panel match the policy.
• A screen is not treated as a final positive.
• Medical information is kept confidential.
• A positive result is not automatically described as impairment.
• The proposed employment action is reviewed separately from the testing decision.

Common Mistakes to Avoid

Assuming Washington prohibited all preemployment THC testing.
Washington prohibits initial hiring decisions based on off-duty cannabis use or nonpsychoactive cannabis metabolites. A scientifically valid method that does not screen for those metabolites may still be used.

Calling THC a psychoactive metabolite.
The principal psychoactive compound is parent THC. THCCOOH, commonly detected in urine, is a nonpsychoactive metabolite.

Assuming every oral-fluid test qualifies.
The employer must verify the analyte, methodology, confirmation process, cutoffs, and final report.

Assuming the Washington rule applies to random testing.
RCW 49.44.240 is an initial hiring restriction. It does not create a general ban on random post-hire cannabis testing.

Assuming Oregon and Washington require entirely different programs.
A single program can work when the employer selects a compatible testing method or creates a compliant reporting workflow.

Using a positive result as proof of impairment.
Neither urine nor oral-fluid testing independently establishes current impairment.

Applying DOT rules to a voluntary non-DOT test.
DOT testing applies only when the employee, function, test reason, and governing federal rule establish coverage.

The Employer’s Main Takeaway

Employers do not have to choose between abandoning THC testing in Washington and operating two completely separate programs.

They need to design the program around the question the test actually answers.

For Washington initial hiring:

• A conventional urine test for non-psychoactive cannabis metabolites generally cannot be used against a nonexempt applicant.
• A scientifically valid oral-fluid test targeting parent THC may be an option if it does not screen for or report nonpsychoactive cannabis metabolites.
• A broader panel may also be used if the cannabis result is not reported to the employer.

For current employees:

• Washington’s initial-hiring restriction does not prohibit random, reasonable-suspicion, or post-incident THC testing.
• The employer still needs a clear policy, reliable methods, medical review, consistent administration, and a separate review of any employment action.

A thoughtful employer can often use one multistate program. The key is understanding the specimen, analyte, testing reason, position, and employment stage before ordering the test.

Related Resources

• Oral-fluid workplace drug testing
• Understanding Non-DOT Testing
• Reasonable-suspicion supervisor training
• Random testing program administration

Frequently Asked Questions

Can Washington employers test applicants for THC?

Yes, but the method matters. RCW 49.44.240 generally prohibits initial hiring decisions based on nonpsychoactive cannabis metabolites. It permits scientifically valid methods that do not screen for those metabolites, subject to the employer confirming the actual analyte and methodology.

Is oral-fluid THC testing automatically legal for Washington hiring?

No. Oral fluid is a specimen type, not a legal conclusion. The employer must confirm that the test detects and reports parent THC rather than a prohibited nonpsychoactive metabolite and that the method is scientifically valid.

Can Washington employers randomly test current employees for cannabis?

RCW 49.44.240 does not prohibit random post-hire testing. Private employers should rely on a clear written policy and address confirmation, medical review, disability, collective bargaining, privacy, consistency, and any industry-specific requirements.

Can an employer use urine THC testing for Washington applicants?

The employer may order a broader panel, but it generally cannot use a nonpsychoactive cannabis-metabolite result against a nonexempt applicant. The statute permits a testing panel that includes cannabis when the cannabis result is not provided to the employer.

Does an oral-fluid THC result prove impairment?

No. Oral-fluid parent THC may be associated with more recent exposure than an inactive urine metabolite, but a result does not independently prove present impairment or exact time of use.

Can one drug-testing policy cover Oregon and Washington?

Yes. A multistate employer may use one overall policy if its testing methods, state-specific provisions, exception process, result reporting, and employment decisions comply with the law applicable to each worker.

The Employer’s Main Takeaway

A defensible non-DOT drug and alcohol testing program requires more than selecting a test panel. Employers should confirm that the policy fits the applicable state, workforce, testing reason, position, collective bargaining obligations, and employment decision. Testing procedures should also distinguish a preliminary screen from a confirmed and medically reviewed result—and should not treat a positive drug result as automatic proof of current impairment.

Before adopting a new policy or materially changing an existing one, employers should coordinate legal review with the practical details of collection, laboratory testing, Medical Review Officer review, documentation, confidentiality, supervisor training, and consistent administration.

Support for Oregon and Washington Employers

A WorkSAFE Service helps employers manage employer-authorized non-DOT testing programs through policy drafting and review, urine and oral-fluid testing options, laboratory and Medical Review Officer setup, random-program administration, collection coordination, and supervisor training. Policy services provide operational support and should be paired with qualified legal review before implementation.

Contact A WorkSAFE Service to discuss a testing program designed for employees in Oregon and Washington.

Compliance Disclaimer

This article provides general compliance information and is not legal advice. Workplace testing requirements depend on the employer, position, testing reason, policy, collective bargaining obligations, and current Oregon, Washington, and federal law. Employers should obtain qualified legal advice for decisions involving discipline, termination, accommodation, or disputed test results.