26 USC 5861.
See:
http://www4.law.cornell.edu/uscode/html/uscode18/usc_sec_18_00000922----000-.htmlhttp://www4.law.cornell.edu/uscode/html/uscode26/usc_sec_26_00005861----000-.htmlNext one should read the Petitioners’ Brief and Respondent’s Brief for D.C. v. Heller at
http://dcguncase.com/blog/case-filings/Then read the SCOTUS decision in D.C. v. Heller, see
http://www.supremecourtus.gov/opinions/07pdf/07-290.pdfThe Democratic Party 2004 platform says "We will protect Americans' Second Amendment right to own firearms" and presumptive presidential candidate Obama says "I have always believed that the Second Amendment protects the right of individuals to bear arms."
Before the Constitution and Bill of Rights, PA said:
A DECLARATION OF THE RIGHTS OF THE INHABITANTS OF THE COMMONWEALTH OR STATE OF PENNSYLVANIA 28 Sept. 1776
"That all men are born equally free and independent, and have certain natural, inherent and inalienable rights, amongst which are, the enjoying and defending life and liberty, acquiring, possessing and protecting property, and pursuing and obtaining happiness and safety."
And
"That the people have a right to bear arms for the defence of themselves and the state; and as standing armies in the time of peace are dangerous to liberty, they ought not to be kept up; And that the military should be kept under strict subordination to, and governed by, the civil power."
VT used the same words in its constitution of 1777.
Now to your question, any law that prevents a law-abiding citizen from keeping and bearing arms for self-defense is a violation of the Second Amendment.
Note that SCOTUS says governments are not obligated to protect an individual unless she/he is in custody.
Over 800,000 sworn law enforcement officers use handguns for self-defense because they are the most effective, efficient tool for that job.
An egregious infringement is the threat by Chairman Vincent C. Gray of the Council of the District of Columbia, "I have been advised that this decision has no immediate impact on our laws prohibiting the possession and use of guns outside of the home. There is no right to carry loaded handguns in the District. That has not changed. Nor will it."
Such a law clearly violates the SCOTUS decision in Heller, "The Second Amendment protects an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home.Pp. 2–53."