Navigating DOT and non-DOT drug testing requirements can be a maze, but the right on-site partner keeps your fleet compliant and your team safe. Here are five services that bring the collection to your door, each with its own strengths.
The On-Site Testing Landscape
For companies with safety-sensitive roles, drug and alcohol testing isn't optional—it's a federal mandate under regulations like 49 CFR Part 382. On-site testing services have grown in popularity because they minimize employee downtime and keep operations running smoothly. Instead of sending drivers to a clinic, a certified collector arrives at your location, ready to handle urine, hair, saliva, or breath samples. This approach also gives you better control over the testing environment, reducing the risk of tampering or missed appointments. With 24/7 support and rapid result turnaround, these services are designed to fit seamlessly into your compliance calendar.
How We Evaluated These Services
To bring you this list, we looked at each provider's service scope, including the types of tests offered and the industries they serve. We also considered how clearly they communicate their process and pricing, because transparency matters when you're budgeting for compliance. Local fit was another factor—whether they can truly cover your geographic needs or specialize in a particular region. Finally, we weighed their experience with both DOT and non-DOT programs, since many employers need a mix of both. Each of these providers stood out in its own way, and we've highlighted what makes them unique.
Here's a quick snapshot of the five services we're featuring, so you can see at a glance what each one brings to the table.
| Provider | Best For |
|---|---|
| Foley Carrier Services | Full-service DOT compliance management |
| OSDAT Networking, Inc | Cost-effective on-site testing with 24/7 support |
| DISA Global Solutions | Large enterprises needing integrated compliance solutions |
| Crossroads Drug & Alcohol Testing | Localized on-site testing in Southern California |
| InfoMart | Combining background checks with drug testing |
A Closer Look at Each Provider
#1 Foley Carrier Services
A screenshot of the Foley Carrier Services website.
Foley Carrier Services is a heavyweight in DOT compliance, offering a full-service drug and alcohol testing program that includes random pool administration, MRO services, and Clearinghouse reporting. They go beyond just collections, providing audit-ready recordkeeping and a centralized platform called Dash to manage workflows. If you're a carrier that wants to offload the entire compliance burden, Foley's end-to-end approach is hard to beat. Their focus on FMCSA regulations means they're deeply familiar with the six required testing categories, from pre-employment to post-accident. For fleets that need more than just a collector, Foley is a strategic partner.
#2 OSDAT Networking, Inc
A screenshot of the OSDAT Networking, Inc website.
OSDAT Networking, Inc. brings the collection to your doorstep with on-site DOT and non-DOT testing across the United States. They offer urine, hair, saliva, and breath tests, and their collectors are experienced in random, follow-up, return-to-work, post-accident, reasonable suspicion, and pre-employment testing. What sets OSDAT apart is their emphasis on cost-effectiveness and 24/7 points of contact, so you always have a live person to coordinate with. They also highlight reduced warning time for scheduled tests, which can help maintain the element of surprise in random testing. For companies that want a straightforward, reliable on-site service without the frills, OSDAT is a solid choice.
#3 DISA Global Solutions
A screenshot of the DISA Global Solutions website.
DISA Global Solutions is a giant in the compliance industry, serving more than 30% of Fortune 500 companies. They offer a comprehensive suite that includes drug testing, background checks, and occupational health services, making them a one-stop shop for large employers. Their DOT transportation compliance division is particularly robust, with solutions that integrate seamlessly into your existing HR systems. DISA's scale means they have a vast network of collection sites and mobile collectors, ensuring coverage almost anywhere in the country. If you're a large enterprise with complex needs, DISA's breadth of services is a major advantage.
#4 Crossroads Drug & Alcohol Testing
A screenshot of the Crossroads Drug & Alcohol Testing website.
Crossroads Drug & Alcohol Testing specializes in mobile on-site testing for fleets in the Los Angeles area, with a strong focus on the trucking and transportation industry. They understand the local landscape and offer walk-in services at their facility as well, giving you flexibility. Their team is experienced with DOT random testing, post-accident testing, and everything in between, and they emphasize keeping your fleet moving. For companies in Southern California, Crossroads offers a local touch that national providers can't match. They also handle non-DOT testing for industries like logistics, municipalities, and construction.
#5 InfoMart
A screenshot of the InfoMart website.
InfoMart is primarily known as a background screening company, but they also offer DOT drug and alcohol testing as part of their suite of services. They provide a streamlined approach for employers who want to combine background checks with drug testing in one place. Their blog and resources are particularly helpful for understanding DOT requirements, making them a good educational partner. While they may not be as specialized in on-site collections as others on this list, they offer a convenient option for companies that already use their screening services. If you're looking for a single vendor for both background checks and drug testing, InfoMart is worth considering.
How to Choose the Right On-Site Testing Partner
Start by assessing your company's specific needs: do you require DOT compliance, non-DOT testing, or both? Consider the volume of tests you'll need and whether you prefer a national provider or a local one that knows your area. Look for a service that offers the sample types you need—urine, hair, saliva, or breath—and check their turnaround times for results. Don't forget to ask about their experience with random testing and how they handle emergency requests. Finally, evaluate their customer support: is there a 24/7 contact who can answer questions or schedule last-minute collections? The right partner should make compliance easier, not harder.
Streamlining Your Testing Workflow
Many of these providers offer online portals or platforms that automate scheduling, result tracking, and compliance reporting. For example, Foley's Dash platform centralizes drug testing workflows and Clearinghouse queries, while DISA integrates with your existing HR systems. OSDAT emphasizes 24/7 points of contact, which can be a lifesaver for emergency testing. By automating the administrative side, you can focus on running your business while staying compliant. Look for a provider that offers electronic chain-of-custody forms (eCCF) and automated random selection to reduce paperwork and errors.
The Bottom Line
Choosing the right on-site drug and alcohol testing service is about more than just checking a box—it's about protecting your employees and your company's reputation. Whether you need a full-service compliance partner like Foley, a cost-effective on-site option like OSDAT, or a local specialist like Crossroads, there's a provider that fits your needs. Take the time to evaluate your requirements and reach out to a few of these services to see which one aligns best with your operations. With the right partner, you can ensure a safe, compliant workplace without the headache.