Substance guides

Drug checking services: Testing substances before use

Published January 28, 2025 · 6 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Drug checking allows people to test substances for dangerous contaminants before use. It is a harm reduction strategy that saves lives.

Fentanyl test strips

Paper strips detecting fentanyl in a dissolved sample. Available from harm reduction organizations. Not 100% reliable but significantly reduce risk. Increasingly legal across states.

Reagent testing

Chemical tests identifying substance classes. Marquis, Mecke, and Mandelin reagents identify common drugs. Available from DanceSafe.org. Identify what a substance IS but not everything it contains.

Spectrometry services

Some harm reduction organizations offer laboratory-grade testing (FTIR, GC/MS). Provides detailed composition analysis. Available at some festivals and fixed sites. The gold standard but limited availability.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

How do I test drugs for fentanyl?

Fentanyl test strips are the most accessible option. Dissolve a small amount in water, dip the strip, and wait for results.

Where can I get drug checking?

Fentanyl test strips from harm reduction organizations. Reagent kits from DanceSafe.org. Spectrometry at select sites.

Are drug checking services legal?

Fentanyl test strips are legal in most states. Some states still classify them as paraphernalia. Legality is expanding.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.