; and no law enforcement officer shall be considered to be in violation of this section for lawfully carrying out the duties of his office or lawfully enforcing ordinances and laws of the United States, the District of Columbia, any of the several States, or any political subdivision of a State. For purposes of the preceding sentence, the term law enforcement officer means any officer of the United States, the District of Columbia, a State, or political subdivision of a State, who is empowered by law to conduct investigations of, or make arrests because of, offenses against the United States, the District of Columbia, a State, or a political subdivision of a State. . (b) Clerical amendment The table of sections for chapter 13 of title 18, United States Code, is amended by inserting after the item related to section 249 the following: 250. Interference with protected rights while in disguise. . 3. Destroying buildings or property within special maritime and territorial jurisdiction while in disguise Section 1363 of title 18, United States Code, is amended by adding at the end the following: Whoever, during the commission of an offense under this section, wears a disguise, including a mask, shall, in addition to any term of imprisonment otherwise imposed under this section, be imprisoned for 2 years. .