Random Drug Testing in the Workplace: Rights, Requirements and Compliance

Random drug testing is an unannounced workplace drug or alcohol screening conducted without advance notice. Employers use random testing to help maintain workplace safety, and discourage substance use on the job.

Employees are typically selected through a computer-generated random process, and tests may occur at unpredictable times throughout the year. Employees may be subject to more frequent random screening if they previously failed a drug test, recently completed a rehabilitation program, or are in safety-sensitive roles.

Keep in mind that not all workplace drug testing is random; it can also be triggered by an event. Employers may test employees:

Random drug testing can happen at any time during employment. An employee is randomly selected through a computer program, employer system, or even an unbiased third party. Once selected, the employee is notified by HR, a supervisor, or a testing provider and given information on how and where to proceed so they can submit a sample for testing. Testing may take place on-site at the workplace, at a designated testing center, or through a certified laboratory.

Employees are often required to provide a sample the same day they are notified. Depending on company policy and testing requirements, employers may collect urine, oral fluid (saliva), blood, or hair samples.

To support compliance and transparency, employers should provide a written drug testing policy and obtain the employee’s consent before conducting screenings. When using a consumer reporting agency like Checkr, employers must disclose testing intentions and receive written authorization to comply with the Fair Credit Reporting Act (FCRA).

Random drug testing generally falls into two categories:

In some cases, employees may be subject to both. Depending on company policy and any applicable laws, testing may take place on-site or at a certified laboratory. Let’s take a closer look at each type of screening.

DOT random drug tests are administered to employees who fall under the Department of Transportation (DOT) regulation umbrella, such as commercial driver’s license (CDL) drivers. Depending on the employer, specific DOT drug testing requirements are set forth by entities like the following:

Each of these DOT agencies sets their own random testing rates each year. These rates specify the minimum percentage of employees that must be tested for drugs or alcohol from a random pool each year, without prior notice, in order to meet federal guidelines.

Here are the random testing thresholds for 2026:

In addition to random drug testing, DOT requirements also include a pre-employment drug test, as well as testing following an accident or eligible traffic violation.

Non-DOT random drug tests are those administered to employees in industries that are not regulated by the US Department of Transportation. These drug tests may be administered in accordance with the employer’s own background check policies as well as state and local drug testing regulations, even if they aren’t subject to DOT guidelines. Non-DOT random drug testing often allows for more flexibility in terms of testing methods, and many employers may choose to conduct cost-effective onsite tests (such as oral fluid tests) or use lab-based tests similar to those required by the DOT.

Depending on the test, random drug screens may show the presence of alcohol, illicit drugs, or certain controlled substances in an employee’s system. FMCSA guidelines require DOT random drug tests to screen for:

Marijuana testing is included in testing in all states since the drug is still considered illegal at the federal level. DOT testing regulations do not allow for marijuana use at any level or for any reason, regardless of local or state laws.

With that said, state and local laws in the US may regulate whether certain non-DOT employers are permitted to test for marijuana in random employee drug testing. States like New York, for instance, have prohibited most employers from testing for marijuana during or prior to employment, excluding some very narrow circumstances.

To comply with regulations when conducting random drug tests in the workplace, employers may want to take a multi-faceted approach. This can include creating a drug testing policy, prioritizing clear employee communication, and following the strictest applicable legal requirements. Here are some tips for following the best practices when random drug testing.

Each employer should outline their specific drug testing requirements and procedures as part of a standard workplace random drug testing policy. To the extent applicable, this policy should also comply with Fair Credit Reporting Act (FCRA). This way, all potential and current employees are aware of expectations, any company requirements and regulations, and possible repercussions for positive drug test results so there’s no confusion about the process.

Depending on where the employer operates, the industry, and even the functions of each employee, employers may be subject to certain federal, state, and local regulations regarding drug testing. It’s important to understand which laws and guidelines apply to which employees, noting that in many cases, you may need to follow more than one standard. Your drug testing policies should align with CBAs and obligations under applicable state laws, such as those in New York and Oklahoma.

Employers should include drug testing information in the employee handbook and provide a copy to employees at the soonest opportunity. This ensures that all employees are made aware of and given access to the company’s random drug testing procedures and understand the implications of such a policy.

If drug testing is also conducted as part of a pre-employment screening, along with steps like education verification and a comprehensive background check, this should be made clear early in the job offer process. Employees should also provide written consent for this drug testing before it is conducted. Obtaining this consent may be mandatory to comply with the FCRA if you work with a third-party background check provider to conduct testing.

Random drug testing laws vary from state to state, and there is no federal regulation regarding random drug testing. In places like New York, for example, non-DOT employees may be subject to random drug testing, but tests may not be used to detect marijuana aside from limited circumstances. Many states allow random employment drug testing, but only if the employee is notified of the policies beforehand and in writing. A few states, like Vermont, Rhode Island, and Maine, significantly restrict random drug testing except for specific situations or permissions.

Typically, states may either permit random drug testing for all lawful uses, limit random drug testing to certain industries or positions, or prohibit random drug testing. Some states may not regulate random drug testing at all.

Different laws regulate random drug testing depending on the state, industry, and even specific substances being tested. Unionized workplaces also must meet the requirements set for them. It’s important for employers to understand the random drug testing laws in the jurisdictions in which they have employees to comply with federal, state and local requirements.

DOT-regulated employees are required to submit to random drug testing over the course of their employment, according to federal guidelines. This can include CDL drivers and other employees that fall under the federal transportation umbrella. DOT random drug testing requirements can cover alcohol, illicit drugs, and certain prescription medications.

The FCRA is a federal law that requires employers working with a CRA to provide written disclosure to, and obtain written consent from, job candidates or employees before conducting a background check (which could include drug testing). If the outcome of a background check may result in adverse action, like choosing not to hire, employers should follow the adverse action process outlined in the FCRA before making a final decision.

Random drug testing laws vary from state to state, and there is no federal regulation regarding random drug testing. In places like New York, for example, non-DOT employees may be subject to random drug testing, but tests may not be used to detect marijuana aside from limited circumstances. Many states allow random employment drug testing, but only if the employee is notified of the policies beforehand and in writing. A few states, like Vermont, Rhode Island, and Maine, significantly restrict random drug testing except for specific situations or permissions.

Typically, states may either permit random drug testing for all lawful uses, limit random drug testing to certain industries or positions, or prohibit random drug testing. Some states may not regulate random drug testing at all.

For employers with a unionized workforce, complying with applicable state and federal drug testing laws is just the starting point. Most collective bargaining agreements (CBAs) address drug testing rights directly, and when they do, those provisions set the rules regardless of what state laws might otherwise permit.

When a CBA is silent on testing, that silence does not give management a free pass to act unilaterally. Because the National Labor Relations Board (NLRB) has held that drug testing is a mandatory subject of bargaining, management will typically still need to bargain with the union before implementing a random testing program. A union can waive its right to bargain over this issue, but that’s relatively rare and difficult to prove. Rolling out a random testing program without complying with the CBA or engaging the union can trigger a formal grievance, a demand to bargain, or an unfair labor practice charge filed with the NLRB.

While there is no universal guideline for how often random drug tests should be conducted, the FMCSA recommends testing employees gradually throughout the year. Also, the FMCSA mandates that DOT employers conduct random drug tests on 50% of their driver pool per year. The permitted or required frequency of random drug screening depends on whether the employee is subject to DOT regulations, the company’s testing policy, and any applicable state or local laws.

The repercussions of a failed or refused random drug test depend on the disciplinary action policies that the employer has put in place. For non-DOT employees, company policy may dictate that the employee be placed on a leave of absence until a confirmation test can be conducted, or that a drug testing refusal results in automatic termination. Note that termination based on refusing a drug test is subject to state and local law. 

DOT-regulated employees who fail or refuse drug or alcohol testing must be immediately removed from any safety-sensitive tasks or positions. The return-to-duty process involves working with a DOT-qualified substance abuse professional, contingent on the specific circumstances.

Typically, yes. Employers use objective selection technology, like computer programs, to ensure random drug tests are truly random and do not target specific employees. The federal employment discrimination regulations included in Title VII of the Civil Rights Act of 1964 make it unlawful for employers to select employees or volunteers for random drug tests based on protected characteristics.

Random drug testing is generally legal in most states, though a few have implemented heavy restrictions on it. For DOT-regulated employees, random testing is a requirement. It’s important for employers to consider any statewide limitations when developing their own drug testing policies.

Random drug testing is conducted without warning, pattern, or selectivity. Reasonable suspicion testing is conducted when an employer has reason to believe that an employee may be under the influence of drugs or alcohol. Reasonable suspicion testing is limited in most states and often requires the belief that testing an employee will result in evidence of current impairment.

Random drug testing helps employers of all sizes maintain compliance with industry regulations while promoting both workplace and public safety. Checkr offers a wide range of pre-employment and post-hire background check options that help you perform faster, safer screenings at any scale. Employers partner with us to speed up and streamline regular or random drug testing, DOT drug testing, criminal record checks, motor vehicle report checks, and many more screening options. With 100+ ATS integrations available, Checkr can help you further merge and simplify your HR operations. Get started with Checkr now.

About the author

Stephanie Colestock is a professional writer who covers a variety of small business and financial topics. For Checkr.com, her work is aimed at helping both employers and job candidates navigate the hiring and employment process in the most informed and effective way.