What Is Pre-Employment Drug Testing and Why Add It to Your Background Screening?
Drug testing is not automatically included in a standard background check. It is a separate component that must be intentionally added to a hiring workflow. Many employers assume that background checks cover everything, but testing for substance use requires its own process, vendors and compliance steps. Understanding how to add drug testing to employment background screening is essential for organizations that want a more complete view of candidate risk.
The business case for adding drug screening is clear. Workplace safety, liability reduction and productivity are all directly impacted by substance abuse. Research has shown that drug-free workplace programs are associated with lower injury rates across multiple industries.
Employees who engage in drug use are more likely to file workers’ compensation claims, and a significant percentage of workplace incidents are linked to substance-related issues. For any employer, especially those in safety-sensitive roles, adding a pre-employment drug test strengthens overall risk management.
At Global Verification Network, we go beyond traditional screening providers. As a Certified Third-Party Administrator, we manage employment drug testing programs with the same level of compliance and precision applied to background screening. This expertise is especially important in regulated industries where testing is mandated, including transportation, healthcare and government contracting.
1. Choose a Reliable Testing Facility
According to Siemens, “Not all laboratories are set up to perform drugs-of-abuse testing in a way that will stand up to legal challenge.” To make sure you find a reputable, trustworthy lab, look for one with SAMHSA certification, special handling procedures for patient specimens, reliable results-reporting services and strong quality-control procedures in place.
2. Establish a Clear Written Policy
Drug testing starts with a clear, consistent policy. This contract between employer and employee is a way to outline all the specifics of being committed to a drug-free workplace, when and why testing may be performed, what happens when someone tests positive, etc. By placing everything in clear documentation, it prevents misunderstandings and protects the company. There are federal and state regulations in place that all government agencies already have to comply with and that private companies would be wise to follow. According to the United States Department of Labor, implementing clear workplace substance use policies can help employers support safety, consistency, and compliance across their workforce. Getting the policy reviewed by a competent attorney is another good safety precaution.
3. Conduct Drug Testing for Job Applicants
The most obvious way to use drug testing is as a screening tool with potential hires. Make it a standard part of background checks in order to screen candidates who shouldn’t qualify to work at your facilities.
4. Conduct Drug Testing at Random for Employees
Another way to use drug testing is at random for your current employees. Random tests are a good way to deter your workers from using drugs and to push toward a consistent drug-free workplace. What’s more, they are fair to everyone because anyone can be tested at any time.
5. Customize the Type and Method of Drug Testing
With today’s drug-screening technology, there are many ways to test for drug use, from urine tests to saliva tests to hair samples. Because the different methods have different costs, requirements and accuracy levels, consider which makes the most sense for your company. Hair testing, for example, can show you up to 90 days of information about whether or not a person has used drugs, while urine tests will show just the last week. Customize which form of testing you use to the needs of your situation.
6. Document Everything Clearly
Both to protect your company and for better quality control, it’s vital to document every part of the drug testing process carefully. As U.S. Department of Transportation says in its Best Practices for DOT Random Drug and Alcohol Testing, “It is the best practice for an employer to document everything on the entire random testing process. This includes the numbers, names drawn, dates and times of notification, dates and times of collections, why a selected employee was not tested during a selection cycle, etc.” In fact, the article goes on to say, “If you’re not sure, document it!”
Federal and State Drug Testing Laws Every Employer Must Navigate
Drug testing programs must operate within a complex legal framework. Several federal laws apply, including the Drug-Free Workplace Act, the fair credit reporting act, the Americans with Disabilities Act and Title VII. These laws govern everything from disclosure requirements to how test results can be used in hiring decisions. State laws add another layer of complexity. Many states have enacted restrictions on testing for marijuana, particularly for non-safety-sensitive roles. Employers must understand where testing is permitted, when it can occur, and how results can be used. These rules continue to evolve, making compliance an ongoing challenge.
GVN’s team is fully FCRA-certified, with senior leadership holding Advanced certification. This ensures that all testing processes, including consent and reporting, meet legal requirements. Proper disclosure and candidate authorization are essential before any testing takes place, and failure to follow these steps can create significant legal exposure.
7 Types of Workplace Drug Tests and When to Use Each One
Drug testing can occur at several points throughout the employment lifecycle. Each type serves a specific purpose and helps reinforce a consistent safety culture:
- Pre-employment testing: the most common and is used to screen candidates before hiring.
- Random testing: helps deter ongoing substance abuse by introducing unpredictability.
- Periodic testing: may be scheduled at regular intervals
- Post-accident testing: used after workplace incidents to determine whether substance use was a factor
- Reasonable suspicion testing: conducted when there are observable signs of impairment
- Return-to-duty testing: after an employee has completed a rehabilitation process
- Follow-up testing: ensures continued compliance over time
Drug Test Methods Compared: Urine, Hair, Oral Fluid and Blood
Employers have several options when selecting a testing method, each with different detection windows and use cases. Urine testing is the most widely used and detects recent drug use over a period of several days to weeks, depending on the substance. Hair testing provides a longer detection window, often up to 90 days, making it useful for identifying patterns of use.
Oral fluid testing detects very recent use, typically within hours to a couple of days. Blood testing offers the most precise measurement of current impairment but has a shorter detection window and higher cost. A blood test may be used in specific circumstances where accuracy is critical.
Employers can also choose from different panel configurations, such as 5-panel, 7-panel or 10-panel tests, depending on which substances they need to detect. GVN helps organizations select the right combination of methods and panels, ensuring they meet compliance requirements without overspending on unnecessary testing.
How to Build a Compliant Drug Testing Policy
Creating a strong drug testing policy begins with clear structure and documentation. A well-defined policy should include a statement of purpose, identify which roles are covered and outline when testing will occur. It should also define the substances being tested, the consequences of a positive result or refusal, and the procedures for maintaining confidentiality.
A critical part of any program is the Medical Review Officer. This licensed physician reviews laboratory results, verifies accuracy and determines whether there is a legitimate medical explanation for a non-negative result. This step protects both the employer and the candidate by ensuring fairness and accuracy.
Employers can use resources like the Department of Labor’s Drug-Free Workplace Advisor as a starting point, but policies should always be tailored to the organization’s needs. GVN supports this process through a single point of contact model, helping clients design and maintain policies without navigating multiple vendors or systems.
How to Add Drug Testing to Your Existing Background Check Workflow
Integrating drug testing into an existing hiring process requires a structured approach.
- First, employers should review their current screening practices to identify gaps.
- Next, they should determine which type of testing and panel best fits their workforce and compliance needs.
- Employers should look for SAMHSA-certified laboratory partnerships, electronic chain-of-custody systems and proven compliance expertise.
- Once a provider is selected, policy documents and candidate disclosures must be updated to reflect testing procedures.
- Training hiring managers is another key step. They need to understand when testing occurs, how to communicate requirements to candidates and how to handle results appropriately.
- Implement and monitor processes.
Most organizations conduct testing after extending a conditional offer, often running it concurrently with a criminal background check to avoid delays.
GVN’s boutique model simplifies this process. With decades of combined experience, our team provides hands-on guidance at every stage, ensuring that drug testing becomes a seamless part of the hiring workflow rather than an afterthought.
Why Drug Testing Remains a Critical Part of Modern Hiring
Adding drug testing to your hiring process is about more than compliance. It is about creating a safer, more productive workplace. A well-structured program reduces risk, improves employee reliability and demonstrates a commitment to safety and accountability.
By following established best practices and working with an experienced partner, employers can implement testing programs that are both effective and compliant. From policy development to ongoing program management, GVN provides the expertise needed to support organizations at every stage.
For employers evaluating whether to expand their screening programs, the answer is increasingly clear. Drug testing is not just an optional add-on. It is a strategic component of modern hiring that helps protect your workforce, your reputation and your bottom line.
The bottom line with drug testing is that it’s too important a process to overlook in your business. As Pat Kelley writes at the Times Record, when job applicants find out you’re doing it, there’s a good chance the quality of your hiring pool will increase. What’s more, when you utilize drug testing in an ongoing way, you can improve staff quality and effectively ensure a drug-free workplace. Use the steps above to begin making the most of this opportunity at your company!
Author Bio:
Christian Moore is the COO at Global Verification Network. He has more then 20 years of investigative and business experience designing efficient and effective drug screen processes for their clients.