Duplicate subjects, dual enrollment in clinical trials, and professional patients can quietly derail even the most well-designed study. It only takes a small number of poor-quality or duplicate participants to distort results, inflate placebo response rates, or cause a clinical trial to fail to meet its endpoints.
Verified Clinical Trials (VCT) is the global leader — and the only true solution — that not only detects but prevents duplicate subjects and other protocol violations at the time of screening. VCT’s protections continue throughout the entire duration of the trial, ensuring subject integrity and data quality from first visit to database lock.
With over a decade of proven experience and a presence in nearly 40 countries worldwide, VCT operates the world’s largest and most comprehensive cross-sponsor clinical trial subject registry. No other database provides real-time, global insight into a participant’s prior clinical trial history — information that is essential for protecting patient safety and ensuring valid study outcomes. Without VCT, there is no reliable way to evaluate this history or verify a subject’s eligibility.
VCT delivers unmatched global coverage and optional biometric verification tools, including fingerprint identification and — coming soon — facial recognition, to confirm participant identity with absolute confidence. It is the only registry that provides end-to-end protection — from Phase I units through Phase IV studies — across all therapeutic areas and regions.
The VCT system detects and prevents:
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Duplicate subjects enrolling across multiple sites or sponsors.
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Professional patients attempting repeated enrollment for compensation or access.
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Protocol violations such as overlapping participation or inadequate washout periods.
The result: cleaner data, reduced risk, faster timelines, and significant cost savings for sponsors, CROs, and research sites alike. In many cases, preventing just a few duplicate or ineligible participants offsets the entire cost of VCT — while safeguarding the scientific validity and success of the trial.
Today, leading pharmaceutical companies, biotechnology firms, CROs, and research sites around the world turn to VCT every day to protect their studies. The system continues to grow exponentially, expanding its reach and reinforcing its position as the industry standard for research subject protection, protocol compliance, and clinical trial success.