Whether you’re in HR, safety, or compliance, choosing a Third-Party Administrator (TPA) for your drug and alcohol testing program is one of the most important decisions you’ll make. And if you’re regulated by DOT, the stakes are even higher.
With so many providers on the market — from slick tech platforms to one-person operations — it’s easy to fall into common traps that can lead to fines, delays, or worse: a non-compliant program.
Here are 7 costly mistakes to avoid — and how to make the right choice.

🚫 Mistake #1: Choosing a Local Clinic as Your TPA
Many companies assume a local occupational health clinic can handle everything. While convenient for collections, most clinics lack the infrastructure for managing random pools, DOT Clearinghouse queries, or audit prep. Instead, use the clinic for collections — and partner with a TPA that specializes in compliance.
💰 Mistake #2: Making Your Decision Based on Price Alone
A low sticker price can come with hidden costs. Who chases missing CCFs? Who handles MROs or tracks testing windows? A true TPA delivers value, not just price — saving you time, hassle, and exposure.
📞 Mistake #3: Deciding After One Phone Call
You’re building a long-term compliance partnership — not ordering office supplies. Take the time to ask in-depth questions (we’ll give you 10 below) and review client references before signing on.
🙅 Mistake #4: Skipping Client References
If a provider can’t offer solid references from safety-sensitive industries, take that as a red flag. Look for peers in your sector who can vouch for their responsiveness, reliability, and results.
🎓 Mistake #5: Ignoring Industry Certifications & Events
Legitimate TPAs participate in NDASA, SAPAA, or FTA training and events — staying current on regs and evolving best practices. Ask who they’re learning from.
💻 Mistake #6: Choosing a “Software-First” Provider
Technology is important — but what happens when you have an urgent DER question at 7:30 AM? Look for human service behind the screens.
👎 Mistake #7: Picking a “Side Hustle” TPA
Drug testing compliance isn’t a side gig. Choose a provider whose entire business revolves around helping employers navigate complex DOT and OSHA rules.

✅ Bonus: 10 Trick Questions to Test a TPA’s Compliance Knowledge
Want to separate the pros from the pretenders? Ask these:
- “Can you explain when post-accident testing is required under FMCSA?”
- “Are instant tests DOT-compliant?”
- “How do you handle donors who can’t provide enough urine?”
- “Do you know the difference between STT and BAT certifications?”
(Grab the full 10-question list in our downloadable guide.)
Why A WorkSafe Service Stands Out
We’ve built our business to solve every one of the pain points listed above:
- Full-service, white-glove program management
- Transparent pricing with no surprise fees
- Dedicated human support (real compliance experts)
- Onsite testing, national clinic access, and fast MRO turnaround
- Audit-ready documentation and proactive alerts
Want to Know More?
✅ Download the full guide: “The HR & Safety Manager’s Guide to Choosing a TPA”
📞 Call us at 503-391-9363
📩 Email drugtesting@aworksafeservice.com