Congress recently considered these problems, in light of the national interest in having law enforcement officers everywhere armed and ready to defend against both individual criminals and organized terrorists. The result was passage of Public Law 108-277, also known as H.R. 218, also known as the Law Enforcement Officers Safety Act (LEOSA) of 2004. The measure, which was signed into law by President George W. Bush and became effective on July 22, 2004, enacted two new sections to Title 18 of the United States Code.
The first section, 926B, deals with the circumstances under which active-duty officers may carry concealed weapons; 926C applies to retired officers. Some of the provisions of both sections are identical, while others are different. Subject to certain limitations and requirements, these statutes override most state and local restrictions on the authority of officers to carry concealed weapons anywhere in the United States.
Common Limitations
Because Congress had to find some law-making authority in the Constitution to supplant local laws relating to firearms possession, it looked to the Commerce Clause (Article I, section 8), which gives the federal government the power to regulate foreign and interstate commerce. The first significant restriction on the national CCW law for officers, therefore, is that it does not apply to weapons that have not "been shipped or transported in interstate or foreign commerce." So you might have difficulty carrying a concealed weapon that was manufactured in your state.
For example, if you are a Massachusetts officer carrying a Smith & Wesson, or a Connecticut officer with a Colt, or a Georgia officer carrying a Glock, you may want to acquire a different off-duty weapon to carry outside your local jurisdiction (though most, if not all, of these weapons will have moved in interstate commerce).To determine whether the new federal law applies to your weapon, the first step is to establish whether or not your particular weapon has moved in foreign or interstate commerce. Your dealer (personally owned weapons) or armorer (departmental issue) should be able to tell you, or you may verify the place of manufacture with the gunmaker.