Federal regulators are seeking public input on a revised definition that could reshape how drug use affects Americans’ gun rights.

The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is currently accepting public comments on an interim final rule revising the federal definition of “unlawful user of or addicted to any controlled substance,” a category of individuals barred from possessing firearms under 18 U.S.C. § 922(g)(3).

The rule took effect January 22, 2026, but the agency is soliciting written public feedback through June 30 before issuing a final version.

From Single Incidents to Habitual Use: ATF Seeks Updated Definition of Unlawful Drug Users

Under federal law, individuals who are unlawful users of controlled substances are prohibited from possessing firearms.

The ATF said the revision is intended to align regulatory language with federal court rulings that require proof of regular or habitual drug use rather than isolated incidents.

“The plain language of the text indicates that the person must be a current unlawful user of a controlled substance, contemporaneous to possessing the firearm,” the agency wrote in the Federal Register notice announcing the rule.

The previous regulatory definition dated to the mid-late 1990s and allowed authorities to infer unlawful drug use from single incidents such as a failed drug test, a drug-related conviction, or an admission of drug use within the previous year. According to the ATF, that approach increasingly conflicted with federal appellate court rulings interpreting the statute.

In fiscal year 2025, the National Instant Criminal Background Check System (NICS) denied roughly 9,163 firearm transfers under the drug-use prohibition, according to the rulemaking document. Of those, about 4,364 denials were based on single-incident inferences, such as one admission or one positive drug test within a year.

The agency acknowledged that most of those cases were not pursued for further investigation.

The interim rule removes the examples that allowed single-use inferences and instead requires evidence that a person “regularly uses a controlled substance over an extended period of time continuing into the present.” It also clarifies that “isolated or sporadic” drug use does not qualify as being an unlawful user for purposes of the firearms prohibition.

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ATF said removing the inference examples would “help reduce confusion for NICS determinations.”

Hunter Biden’s Gun Conviction Spotlights National Debate on Drug-User Firearm Ban

The debate surrounding the federal drug-use firearm ban gained national attention during the prosecution of Hunter Biden, the son of former President Joe Biden.

In June 2024, a federal jury convicted Hunter Biden of three felonies related to the purchase and possession of a firearm while allegedly using illegal drugs, according to the Department of Justice.

Prosecutors said he falsely certified on a federal firearm transaction form that he was not an unlawful drug user when he purchased a revolver in October 2018.

Hunter has had well-documented struggles with substance abuse, which has, at times, included crack cocaine. His attorneys argued during court proceedings that the federal statute used against him violated the Second Amendment.

 

Gun rights organizations also raised constitutional concerns about the statute after the conviction. Groups, including Gun Owners of America and others, said the law used in the case was unconstitutional, according to reporting from Fox News.

The case never reached the Supreme Court. Hunter Biden was later pardoned by his father during the final days of his presidency, rendering the potential constitutional challenge moot.

Public Comments Reveal Divided Views

Public comments submitted during the current rulemaking process show a range of opinions.

One commenter argued the rule still creates a “legal double standard” by protecting patients who slightly deviate from prescription instructions while not explicitly shielding individuals participating in state-authorized medical marijuana programs.

Another commenter supported the revised definition, arguing it properly distinguishes between individuals who once used drugs and those struggling with chronic addiction that may lead to criminal behavior.

The ATF described the regulation as an interpretive rule rather than a new law and said it aims to better match how courts have interpreted the statute.

“Future section 922(g)(3) NICS determinations that deny firearm transactions, and future ATF enforcement decisions, will therefore require evidence of regular and recent use,” the agency wrote.

Officials indicated the rule could reduce erroneous denials while still allowing authorities to block firearm purchases by individuals who demonstrate ongoing unlawful drug use.

The agency said it may revisit the issue again after reviewing public comments and after the pending federal litigation related to the statute concludes.