Maryland Drug Testing Laws for Employers and Employees

Maryland drug testing laws let employers require workers and applicants to be tested for drugs or alcohol when there is a legitimate, job-related reason, but the testing has to follow the procedures in Health-General Article §17-214. That statute controls how specimens are collected, which laboratories may analyze them, who pays, and what the employer owes an employee after a positive result.¹ Nothing in the law forces a private employer to test, and nothing limits which substances can be included on a panel; the rules govern how testing is done, not whether.

What Employers Must Do to Run a Valid Test

Section 17-214 applies whenever an employer requires a person to be tested for job-related reasons for the use or abuse of a controlled dangerous substance or alcohol. That covers pre-employment screens, reasonable-suspicion tests, post-accident testing, and random testing.

Four requirements matter most:

Specimens must go to a laboratory that holds a permit under the Health-General Article, or, if the lab is out of state, one that is certified or otherwise approved under the statute.¹
The employer pays for the test. Maryland places this cost on the employer, not the person being tested.²
When a preliminary screening device is used, the employer must collect, handle, store, and ship the specimen in a way that preserves the donor’s identity, confidentiality, and the integrity of the sample.¹
After a confirmed positive, the employer must give the employee a copy of the written policy on substance use and, if the employee asks at the time of testing, the name and address of the lab.¹

Violating the subtitle governing laboratories and testing is a misdemeanor. The maximum fine is modest, but a procedural failure can also invalidate a positive result that led to termination or discipline, and it opens the door to civil liability.

Employee Rights After a Positive Test

Anyone required to submit to a job-related test has the right to independent verification of the result under §17-214(e). The retest has to be done by a laboratory that holds a state permit or is otherwise approved. There is one important cost shift: the initial test is on the employer, but the person requesting the verification pays for it.¹

Retesting is not the only path. Procedural failures on the employer’s side are often the strongest challenge. If the lab was not certified, if the chain of custody broke down, if the employer never provided the written substance-use policy after the positive, or if the employer refused to identify the lab when asked, those failures can undo the result. Employees can also present evidence of a lawful prescription or a medical condition that explains a positive screen, and employers are expected to give a fair chance to respond before acting.

Prescription Medications and the ADA

The Americans with Disabilities Act does not protect current illegal drug use, but it does protect people who take lawfully prescribed controlled substances, including opioids, as directed by a health care provider. EEOC guidance notes that policies prohibiting all medications are likely to violate the ADA, and so are drug tests that collect information about lawful prescription use beyond what is needed to detect illegal substances.³ When an employee tests positive and holds a valid prescription, the employer should evaluate whether the medication actually affects safe job performance before acting on the result.

People who used drugs in the past, completed rehabilitation, and are no longer using may also be protected. The line is “current” illegal use. Someone who tested positive months ago, completed treatment, and has stayed clean generally falls outside the current-use exclusion.

Cannabis Use and Workplace Testing

Maryland legalized recreational cannabis for adults 21 and older on July 1, 2023, but the legalization law kept employer testing authority intact. Section 36-1301 of the Cannabis Article states that nothing in the law prevents an employer from denying employment or a contract, or from disciplining an employee or contractor, for testing positive for cannabinoids or cannabinoid metabolites when the test was conducted under the employer’s established drug testing policy.⁴ Legal off-duty cannabis use is not a shield against a workplace drug test.

Government employers may also discipline for on-the-job use or working while impaired, and the statute specifically preserves that authority for tasks that would amount to negligence or professional malpractice if performed under the influence.⁴ Any protection under the legalization law also yields to conflicting federal law, which matters for employers with federal contracts or funding. State executive branch policy separately prohibits medical cannabis patients from possessing or consuming cannabis on state property or during work time.⁵ The Maryland Judiciary treats workplace cannabis impairment the same as alcohol or other drug impairment.⁶

Tampering With a Sample Is a Separate Crime

Maryland treats specimen tampering as its own offense under Criminal Law Article §10-111. The statute prohibits altering a bodily fluid sample, substituting someone else’s specimen, possessing or using an adulterant, selling or distributing urine or adulterants, and transporting those materials into Maryland with intent to defraud or change the outcome of a drug or alcohol screening test.⁷

A first violation is a misdemeanor punishable by up to one year in jail, a fine of up to $1,000, or both.⁷
A subsequent violation is a misdemeanor punishable by up to three years in jail, a fine of up to $5,000, or both.⁷

The employment consequences are steep on top of the criminal exposure. Under DOT rules, an adulterated or substituted specimen is treated as a refusal to test, which triggers immediate removal from safety-sensitive duties.⁸ Outside federally regulated industries, few employers will keep an employee after a documented attempt to cheat a test.

When Federal Rules Take Over

Maryland’s rules yield to federal testing requirements in regulated industries. The Department of Transportation’s testing regime at 49 CFR Part 40 requires drug and alcohol testing for safety-sensitive employees in aviation, trucking, transit, pipelines, and railroads. Under DOT rules, an employer with a verified positive result must immediately remove the worker from safety-sensitive duties.⁸

Federal agencies themselves must use laboratories certified by the Department of Health and Human Services under the Mandatory Guidelines for Federal Workplace Drug Testing Programs, last revised in October 2023.⁹ Many Maryland private employers use HHS-certified labs voluntarily because it strengthens the credibility of results if a positive is challenged.

Employers often ask whether OSHA’s anti-retaliation rule at 29 CFR §1904.35(b)(1)(iv) blocks post-accident drug testing. It does not. OSHA clarified in a 2018 memorandum that post-incident testing does not violate the standard as long as the employer’s purpose is workplace safety rather than punishing an employee for reporting an injury. OSHA also expects the employer to test everyone whose conduct could have contributed to the incident, not only the injured worker.¹⁰

Public Employees and the Fourth Amendment

Government employer testing counts as a search by a state actor, so the Fourth Amendment applies. In Skinner v. Railway Labor Executives’ Association (1989), the U.S. Supreme Court upheld mandatory post-accident drug and alcohol testing of railroad workers as reasonable even without a warrant or individualized suspicion, weighing the government’s safety interest against employee privacy.¹¹ The decision does not authorize unlimited testing. Suspicionless testing is easiest to defend for safety-sensitive positions such as train operators, bus drivers, or law enforcement. A public employer that randomly tests office workers with no safety-sensitive duties faces a harder constitutional argument, and employees in those roles have stronger grounds to challenge testing as unreasonable.

Union Workplaces

Drug testing of current employees is a mandatory subject of bargaining under the National Labor Relations Act because it bears directly on the working environment and continued employment can depend on the results.¹² An employer cannot unilaterally impose a new testing program on a unionized workforce, and a general management-rights clause in a contract does not automatically waive the union’s right to bargain over testing procedures. Testing of job applicants is different, because applicants are not “employees” under the NLRA, so applicant screening does not require union approval. Collective bargaining agreements typically address which substances are tested, the procedures used, consequences of a positive result, and retesting rights.

FMLA Leave for Treatment

An employee who needs time off for substance abuse treatment may qualify for job-protected leave under the federal Family and Medical Leave Act when the treatment counts as care for a serious health condition, typically inpatient rehabilitation or continuing outpatient treatment by a health care provider. Eligibility requires 12 months of employment, at least 1,250 hours worked in the previous 12 months, and an employer with 50 or more employees. FMLA protects the leave for treatment, not absences caused by substance use itself. An employer cannot fire someone for taking FMLA-qualifying leave for rehabilitation, but it can still enforce a drug-free workplace policy for conduct that violates workplace rules.

Workers’ Compensation After a Positive Test

A positive drug test after a workplace injury can complicate a Maryland workers’ compensation claim. Insurance carriers often raise a positive THC or other drug result to argue that intoxication contributed to the accident and to deny or delay benefits. Cannabis legalization does not change the analysis, because the question is whether impairment caused the injury, not whether the substance was legal to possess. An injured worker who tests positive should expect closer scrutiny of the claim and should document the circumstances of the injury carefully.

1
Maryland General Assembly. Health – General 17-214
2
Maryland Department of Labor. Drug Testing – The Maryland Guide to Wage Payment and Employment Standards
3
EEOC Presentation. Drug Use Under the Americans with Disabilities Act
4
Maryland General Assembly. 2023 Regular Session – House Bill 556 Chapter
5
Department of Budget and Management. Substance Abuse Policy 2023
6
Maryland Courts. 3.6 Policy on Substance Use and Misuse
7
Maryland General Assembly. Maryland Criminal Law Code 10-111 – Altering Drug or Alcohol Screening Test
8
eCFR. 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs
9
govinfo. Current List of HHS-Certified Laboratories and Instrumented Initial Testing Facilities Which Meet Minimum Standards To Engage in Urine and Oral Fluid Drug Testing for Federal Agencies
10
Occupational Safety and Health Administration. Clarification of OSHA’s Position on Workplace Safety Incentive Programs and Post-Incident Drug Testing Under 29 CFR 1904.35(b)(1)(iv)
11
LII / Legal Information Institute. Skinner v. Railway Labor Executives Association
12
Office of the Law Revision Counsel. 29 USC 158 – Unfair Labor Practices