(a)(1) Whoever knowingly mutilates, defaces, physically defiles, burns, maintains on the floor or ground, or tramples upon any flag of the United States shall be fined under this title or imprisoned for not more than one year, or both.
(2) This subsection does not prohibit any conduct consisting of the disposal of a flag when it has become worn or soiled.
(b) As used in this section, the term ''flag of the United States'' means any flag of the United States, or any part thereof, made of any substance, of any size, in a form that is commonly displayed.
(c) Nothing in this section shall be construed as indicating an intent on the part of Congress to deprive any State, territory, possession, or the Commonwealth of Puerto Rico of jurisdiction over any offense over which it would have jurisdiction in the absence of this section.