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Contaminants including fentanyl and fentanyl analogs are now present in the illicit drug supply throughout the U.S. Because no safe supply of most illicitly used drugs is available, helping people determine what is in the drugs they obtain can be an impactful harm reduction intervention. The easiest and most inexpensive way to accomplish this is often through use of fentanyl test strips and xylazine test strips. This resource outlines the legality of drug checking equipment in 50 states and the District of Columbia.