7 U.S.C. § 2156 : US Code - Section 2156: Animal fighting venture prohibition

    (a) Sponsoring or exhibiting an animal in an animal fighting
      venture
      (1) In general
        Except as provided in paragraph (2), it shall be unlawful for
      any person to knowingly sponsor or exhibit an animal in an animal
      fighting venture.
      (2) Special rule for certain State (!1)

        With respect to fighting ventures involving live birds in a
      State where it would not be in violation of the law, it shall be
      unlawful under this subsection for a person to sponsor or exhibit
      a bird in the fighting venture only if the person knew that any
      bird in the fighting venture was knowingly bought, sold,
      delivered, transported, or received in interstate or foreign
      commerce for the purpose of participation in the fighting
      venture.
    (b) Buying, selling, delivering, possessing, training, or
      transporting animals for participation in animal fighting venture
      It shall be unlawful for any person to knowingly sell, buy,
    possess, train, transport, deliver, or receive any animal for
    purposes of having the animal participate in an animal fighting
    venture.
    (c) Use of Postal Service or other interstate instrumentality for
      promoting or furthering animal fighting venture
      It shall be unlawful for any person to knowingly use the mail
    service of the United States Postal Service or any instrumentality
    of interstate commerce for commercial speech for purposes of
    advertising an animal, or an instrument described in subsection
    (e), for use in an animal fighting venture, promoting (!2) or in
    any other manner furthering an animal fighting venture except as
    performed outside the limits of the States of the United States.

    (d) Violation of State law
      Notwithstanding the provisions of subsection (c) of this section,
    the activities prohibited by such subsection shall be unlawful with
    respect to fighting ventures involving live birds only if the fight
    is to take place in a State where it would be in violation of the
    laws thereof.
    (e) Buying, selling, delivering, or transporting sharp instruments
      for use in animal fighting venture
      It shall be unlawful for any person to knowingly sell, buy,
    transport, or deliver in interstate or foreign commerce a knife, a
    gaff, or any other sharp instrument attached, or designed or
    intended to be attached, to the leg of a bird for use in an animal
    fighting venture.
    (f) Investigation of violations by Secretary; assistance by other
      Federal agencies; issuance of search warrant; forfeiture; costs
      recoverable in forfeiture or civil action
      The Secretary or any other person authorized by him shall make
    such investigations as the Secretary deems necessary to determine
    whether any person has violated or is violating any provision of
    this section, and the Secretary may obtain the assistance of the
    Federal Bureau of Investigation, the Department of the Treasury, or
    other law enforcement agencies of the United States, and State and
    local governmental agencies, in the conduct of such investigations,
    under cooperative agreements with such agencies. A warrant to
    search for and seize any animal which there is probable cause to
    believe was involved in any violation of this section may be issued
    by any judge of the United States or of a State court of record or
    by a United States magistrate judge within the district wherein the
    animal sought is located. Any United States marshal or any person
    authorized under this section to conduct investigations may apply
    for and execute any such warrant, and any animal seized under such
    a warrant shall be held by the United States marshal or other
    authorized person pending disposition thereof by the court in
    accordance with this subsection. Necessary care including
    veterinary treatment shall be provided while the animals are so
    held in custody. Any animal involved in any violation of this
    section shall be liable to be proceeded against and forfeited to
    the United States at any time on complaint filed in any United
    States district court or other court of the United States for any
    jurisdiction in which the animal is found and upon a judgment of
    forfeiture shall be disposed of by sale for lawful purposes or by
    other humane means, as the court may direct. Costs incurred for
    care of animals seized and forfeited under this section shall be
    recoverable from the owner of the animals (1) if he appears in such
    forfeiture proceeding, or (2) in a separate civil action brought in
    the jurisdiction in which the owner is found, resides, or transacts
    business.
    (g) Definitions
      In this section - 
        (1) the term "animal fighting venture" means any event, in or
      affecting interstate or foreign commerce, that involves a fight
      conducted or to be conducted between at least 2 animals for
      purposes of sport, wagering, or entertainment, except that the
      term "animal fighting venture" shall not be deemed to include any
      activity the primary purpose of which involves the use of one or
      more animals in hunting another animal;
        (2) the term "instrumentality of interstate commerce" means any
      written, wire, radio, television or other form of communication
      in, or using a facility of, interstate commerce;
        (3) the term "State" means any State of the United States, the
      District of Columbia, the Commonwealth of Puerto Rico, and any
      territory or possession of the United States; (!3)

        (4) the term "animal" means any live bird, or any live mammal,
      except man.
    (h) Relationship to other provisions
      The conduct by any person of any activity prohibited by this
    section shall not render such person subject to the other sections
    of this chapter as a dealer, exhibitor, or otherwise.
    (i) Conflict with State law
      (1) In general
        The provisions of this chapter shall not supersede or otherwise
      invalidate any such State, local, or municipal legislation or
      ordinance relating to animal fighting ventures except in case of
      a direct and irreconcilable conflict between any requirements
      thereunder and this chapter or any rule, regulation, or standard
      hereunder.
      (2) Omitted
    (j) Criminal penalties
      The criminal penalties for violations of subsection (a), (b),
    (c), or (e) are provided in section 49 of title 18.