Fentanyl test strips (FTS) are small strips of paper that can detect the presence of fentanyl in all different kinds of drugs (cocaine, methamphetamine, heroin, etc.) and drug forms (pills, powder, and injectables). There is a growing movement to make these strips free and legal in every state to help prevent fentanyl overdoses and deaths.
In April 2021, CDC and the Substance Abuse and Mental Health Services Administration (SAMHSA) announced federal funding could be used to purchase FTS.
Source: Fentanyl Test Strips: A Harm Reduction Strategy (cdc.gov)