Overview of Workplace Drug Testing
Workplace drug testing is a common practice designed to maintain a safe, productive, and drug-free work environment. However, drug testing programs must balance legitimate safety and business concerns with employee privacy rights and evolving state laws, particularly regarding marijuana. HR professionals must understand the legal landscape, design compliant policies, and implement testing procedures that protect both the organization and its employees.
Federal Drug Testing Requirements
Drug-Free Workplace Act
The Drug-Free Workplace Act of 1988 requires certain federal contractors and grantees to maintain drug-free workplace policies. While the Act does not mandate drug testing, it requires covered employers to publish a drug-free workplace statement, establish a drug-free awareness program, and notify employees that drug-related violations are prohibited.
Department of Transportation (DOT) Regulations
The DOT mandates drug and alcohol testing for employees in safety-sensitive positions in industries such as aviation, trucking, railroads, mass transit, pipeline operations, and maritime. These regulations specify the substances tested, the testing procedures, the frequency of testing, and the consequences of positive results. DOT testing follows strict protocols and uses federally certified laboratories.
Types of Drug Testing
Pre-Employment Testing
Pre-employment drug testing is conducted after a conditional offer of employment has been extended. This is the most common form of workplace drug testing and is generally permissible in all states, though some states have specific notice requirements or restrict testing to certain positions.
Reasonable Suspicion Testing
Employers may test employees when a trained supervisor observes specific, articulable signs of impairment or drug use. Documenting the observable behaviors that led to the testing decision is critical. Examples include slurred speech, impaired coordination, the smell of alcohol or marijuana, and erratic behavior. Supervisors should receive training on recognizing these signs and following proper procedures.
Post-Accident Testing
Many employers test employees involved in workplace accidents that result in injury or significant property damage. OSHA has cautioned that automatic post-accident testing policies can discourage employees from reporting injuries. To comply with OSHA guidance, limit post-accident testing to situations where there is a reasonable basis to believe drug or alcohol use may have contributed to the incident.
Random Testing
Random testing involves selecting employees for testing without prior notice, using a scientifically valid random selection method. Random testing is most common in safety-sensitive industries and is required by DOT regulations for covered positions. Some states restrict random testing for non-safety-sensitive positions.
Return-to-Duty and Follow-Up Testing
Employees who have tested positive and completed a substance abuse program may be subject to return-to-duty testing before resuming work and follow-up testing for a specified period afterward. These testing protocols help ensure that the employee has successfully addressed the substance abuse issue.
The Marijuana Challenge
The legalization of marijuana for medical and recreational use in many states has created significant complexity for workplace drug testing. While marijuana remains illegal under federal law, employers must navigate conflicting state laws that may protect employees who use marijuana off-duty or for medical purposes. Key considerations include whether your state has a medical marijuana law that includes employment protections, whether your state restricts testing for marijuana in certain circumstances, whether your employees are subject to federal regulations that require marijuana testing, and whether your policy distinguishes between impairment and the mere presence of marijuana metabolites in a test result.
Developing a Drug Testing Policy
An effective drug testing policy should include a clear statement of the policy's purpose and scope, a list of prohibited substances, the types of testing conducted (pre-employment, random, reasonable suspicion, etc.), testing procedures and chain of custody requirements, consequences of positive test results or refusal to test, confidentiality protections for test results, information about employee assistance resources, and a statement of employees' right to challenge or explain test results.
Best Practices for Implementation
- Use certified laboratories that follow chain-of-custody protocols
- Confirm all positive screening results with a confirmatory test (such as GC-MS)
- Designate a Medical Review Officer (MRO) to review and verify test results
- Provide employees with the opportunity to explain positive results (prescription medications, for example)
- Train supervisors on reasonable suspicion indicators and documentation
- Review and update the policy regularly to reflect changes in state law
- Apply the policy consistently to all employees in similar positions
SHRM Exam Preparation
For the SHRM exam, be familiar with the legal framework for drug testing, including the Drug-Free Workplace Act, DOT regulations, and the impact of state marijuana laws. Understand the different types of testing, the importance of chain of custody and confirmatory testing, and the role of the MRO. Questions may present scenarios where you must determine whether a particular testing practice is legally appropriate or recommend the best course of action following a positive test result.