It is already illegal for anyone convicted of domestic violence (or subject to a restraining order) to possess firearms. The ATF form 4473[1] includes these questions about domestic violence:
> Are you subject to a court order, including a Military Protection Order issued by a military judge or magistrate, restraining you from harassing, stalking, or threatening your child or an intimate partner or child of such partner?
> Have you ever been convicted in any court of a misdemeanor crime of domestic violence, or are you or have you ever been a member of the military and been convicted of a crime that included, as an element, the use of force against a person as identified in the instructions?
The information is verified by NICS[2], which will reject you if you've been convicted of domestic violence or are subject to a court order. Lying on this form is a felony punishable by up to 5 years in prison. The penalty applies even if the NICS check fails (meaning you never got possession of the firearm).
> Are you subject to a court order, including a Military Protection Order issued by a military judge or magistrate, restraining you from harassing, stalking, or threatening your child or an intimate partner or child of such partner?
> Have you ever been convicted in any court of a misdemeanor crime of domestic violence, or are you or have you ever been a member of the military and been convicted of a crime that included, as an element, the use of force against a person as identified in the instructions?
The information is verified by NICS[2], which will reject you if you've been convicted of domestic violence or are subject to a court order. Lying on this form is a felony punishable by up to 5 years in prison. The penalty applies even if the NICS check fails (meaning you never got possession of the firearm).
1. https://www.atf.gov/firearms/docs/4473-part-1-firearms-trans...
2. https://en.wikipedia.org/wiki/National_Instant_Criminal_Back...