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Duplicate Research Subjects: The Silent Threat to Your Clinical Trial — And How Verified Clinical Trials Protects You

Clinical trials are complex, high-stakes endeavors where every detail matters — yet one hidden risk continues to undermine studies across all therapeutic areas: duplicate and professional research subjects.

You may believe your internal checks, EDC reviews, or sponsor-specific solutions have you covered. The reality?
Most systems only detect duplicate subjects after they’ve already dosed — or worse, after they’ve completed the study. At that point, the damage is done: data integrity is compromised, timelines are derailed, and costly regulatory risks escalate.

Duplicate research subjects are more common than most realize — and far more dangerous.
They silently infiltrate trials, chasing compensation or study drugs, jeopardizing safety and reliability. Even in therapeutic areas considered “low risk,” duplicate participation happens every day, threatening your study’s validity.

At Verified Clinical Trials (VCT), we don’t wait for problems to surface after the fact.
We prevent them at the only time that matters: before a subject ever enters your trial.

Why Verified Clinical Trials Works — When Others Don’t:

  • Real-Time Verification at Screening: VCT checks each subject at the time of screening — before they can impact your study.
  • Cross-Sponsor & Cross-Therapeutic Area Protection: Our network spans sponsors, CROs, and sites globally, catching subjects attempting to enroll in multiple trials across different companies and therapeutic areas.
  • Global Reach: VCT operates worldwide, protecting studies in North America, Europe, Asia, and beyond — a truly global safety net for your clinical programs.
  • Biometric Integration: With advanced biometric capabilities, VCT ensures unparalleled accuracy in subject verification.
  • Regulatory & Safety Assurance: By reducing protocol deviations and adverse event risks, VCT supports regulatory compliance and enhances subject safety.

The Cost of Doing Nothing:

Allowing duplicate subjects into your trial isn’t just a data issue — it’s a risk to your investment, your timeline, and your reputation. Detecting them after dosing or completion is too late and can cost millions in protocol deviations, failed endpoints, or even regulatory action.

The Solution Is Simple — And Proven.

Verified Clinical Trials offers a proven, proactive safeguard that saves time, reduces costs, and protects the integrity of your research. No other system compares.


Protect your trial before it starts.
Verified Subjects are Better Subjects.

Contact us today to learn more