The Bureau of Alcohol, Tobacco, Firearms, and Explosives is moving to significantly revise how federal law defines who qualifies as an “unlawful user of or addicted to a controlled substance” for purposes of firearm possession, a change that would end the long-standing practice of denying gun purchases based on a single incident of drug use.
The change comes through an interim final rule from the Department of Justice that is scheduled for official publication in the Federal Register on January 22. Once effective, the rule will immediately revise ATF regulations implementing the Gun Control Act by removing examples that allowed a person to be deemed a prohibited firearm purchaser based on a single drug-related event within the past year, such as an admission of use, a failed drug test, or a lone misdemeanor drug conviction.
Under current regulations, those single incidents have frequently triggered automatic denials through the FBI’s National Instant Criminal Background Check System, even though federal courts have repeatedly held for decades that the statute requires more than isolated or sporadic use. Courts across multiple circuits have emphasized that the prohibition applies only when there is a clear temporal nexus between firearm possession and regular, ongoing drug use.
ATF acknowledges in the rule that this disconnect has resulted in thousands of firearm denials each year that do not align with prevailing judicial interpretations. Agency data show that in fiscal year 2025 alone, more than 4,000 firearm purchases were denied based solely on single-incident inferences, despite ATF field offices generally declining to pursue enforcement actions in such cases because they lack evidence of habitual use.
The revised definition now explicitly states that an “unlawful user” is someone who regularly uses a controlled substance over an extended period of time continuing into the present, without a lawful prescription or outside the bounds of medical direction. The rule also clarifies that a person is not an unlawful user if their drug use was isolated, sporadic, or has ceased, and that minor deviations from a valid prescription do not trigger the prohibition.
ATF describes the change as necessary to prevent erroneous denials, reduce constitutional concerns, and bring federal regulations into line with long-standing case law and existing enforcement practices. While the rule is being issued on an interim basis, the agency is accepting public comments through June 30 and may revisit the definition again after pending Supreme Court litigation is resolved.
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