Source: http://uscode.house.gov/view.xhtml?req=(title:7%20section:2156%20edition:prelim)
Timestamp: 2019-04-25 21:44:29+00:00

Document:
2018-Subsec. (a)(1). Pub. L. 115–334, §12616(a)(1)(A), substituted "It" for "Except as provided in paragraph (3), it".
2014-Subsec. (a). Pub. L. 113–79, §12308(b)(1)(A), substituted "Sponsoring or exhibiting an animal in, attending, or causing an individual who has not attained the age of 16 to attend," for "Sponsoring or exhibiting an animal in" in heading.
2008-Subsec. (a)(1). Pub. L. 110–246, §14207(a)(1)(A), struck out ", if any animal in the venture was moved in interstate or foreign commerce" before period at end.
2007-Subsec. (c). Pub. L. 110–22, §3(1), substituted "instrumentality of interstate commerce for commercial speech" for "interstate instrumentality".
Subsec. (g)(3). Pub. L. 110–22, §3(4)(B), added par. (3) and struck out former par. (3) which read as follows: "the term 'interstate instrumentality' means telegraph, telephone, radio, or television operating in interstate or foreign commerce;".
2002-Subsec. (a). Pub. L. 107–171, §10302(a)(1), added subsec. (a) and struck out former subsec. (a) which read as follows: "It shall be unlawful for any person to knowingly sponsor or exhibit an animal in any animal fighting venture to which any animal was moved in interstate or foreign commerce."
Pub. L. 115–334, title XII, §12616(e), Dec. 20, 2018, 132 Stat. 5016 , provided that: "The amendments made by this section [amending this section, section 49 of Title 18, Crimes and Criminal Procedure, and section 3001 of Title 39, Postal Service] shall take effect on the date that is one year after the date of the enactment of this Act [Dec. 20, 2018]."
Pub. L. 107–171, title X, §10302(b), May 13, 2002, 116 Stat. 492 , provided that: "The amendments made by this section [amending this section] take effect 1 year after the date of enactment of this Act [May 13, 2002]."
Pub. L. 107–171, title X, §10303(b), May 13, 2002, 116 Stat. 492 , provided that: "The amendment made by this section [amending this section] takes effect 1 year after the date of enactment of this Act [May 13, 2002]."

References: §12616
 §12308
 §14207
 §3
 §3
 §10302
 §12616
 §10302
 §10303