Hub · Guides

Guides

Long-form, evergreen references. Read these when you want depth — every guide is sourced, medically reviewed, and updated against the current regulatory landscape.

Detection

The complete guide to drug test detection windows

Substance-by-substance windows across urine, saliva, hair, blood, and breath — with caveats and primary sources.

For Individuals · Employers 12 min read

Workplace

Drug testing for employers: a 2026 compliance overview

DOT vs non-DOT, panel choice, MRO, state cannabis law, training, and program management.

For Employers 14 min read

Accuracy

Understanding false positives & cross-reactivity

Why immunoassay flags benign substances, and how confirmation testing rules them out.

For Healthcare · Individuals 10 min read

How it works

Screening vs confirmation — immunoassay, GC-MS, LC-MS/MS

How two-step testing achieves sensitivity and specificity. The 30-minute analytical-chemistry explainer.

For Healthcare · Employers 11 min read