Illegal firearms activity, including trafficking and stolen weapons, can be reported directly to the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) via phone, online, or the ReportIt® mobile app. Meanwhile, research indicates that crowd-control weapons, often classified as "less-lethal," can cause serious injury or death when misused, according to reports from Physicians for Human Rights. For detailed information on submitting a tip, visit the ATF online tip form .