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Staring at a test strip and wondering, “Did I pass?” is one of the most common stress points before a screening. Faint lines can cause confusion, but with a clear understanding of how to read your results—and a few testing best practices—you’ll know exactly what you’re looking at. Understanding the Basics Most home and workplace drug tests use immunoassay technology. Each test window includes: C (Control Line): Confirms the test worked properly. T (Test Lin …