If you think the abuser is violating state firearm laws, you can call your local police or sheriff department or the state police. If you think the abuser is violating federal firearm laws, you can call the Bureau of Alcohol, Tobacco and Firearms (ATF).
You can find contact information for sheriff departments in your area on our DC Sheriff Departments page.
You can find ATF field offices in Washington, D.C. on the ATF website. For reporting illegal firearm activity, a person can also call 1-800-ATF-GUNS (1-800-283-4867). Many ATF offices have victim advocates on staff (called “victim/witness coordinators”) and so perhaps you may ask to speak one of these advocates if you are having a hard time connecting with (or receiving a call back from) an ATF officer.
A local domestic violence organization in your area may also be able to answer your questions and assist you in talking to the necessary law enforcement officials. You will find contact information for organizations in your area on our DC Advocates and Shelters page.
Note: Generally, the abuser does not have to have knowledge of the law in order to be arrested for breaking the law. If the abuser has or buys a gun in violation of the law, the abuser can be arrested, whether or not s/he knows that s/he was in violation of the law.1
1United States v. Lippman, 369 F. 3d 1039 (8th Cir. 2004); United States v. Henson, 55 F. Supp. 2d 528 (S.D. W.V. 1999)