"Legislation in the United States
There are US Department of Agriculture (USDA) laws governing the transportation of horses to processing plants.
Two bills, H.R. 503 in the House and S. 1915 in the Senate, were introduced last session to prevent the slaughter of horses for human consumption in the United States. H.R. 503 was passed in the House on September 7, 2006. The bill was anonymously blocked from a vote in the Senate, so
both bills died at the end of the session. H.R. 503 and S. 311 were introduced January 17, 2007. The text of the bill reads:
A bill to amend the Horse Protection Act to prohibit the shipping, transporting, moving, delivering, receiving, possessing, purchasing, selling, or donation of horses and other equines to be slaughtered for human consumption, and for other purposes.
A separate bill ensures that none of America's wild mustangs are sent to slaughter.
On February 22, 2007, Rep. Robert Molaro introduced a bill, HB1711, to the Illinois General Assembly to prohibit the transportation of horses into the State for the sole purpose of slaughter for human consumption.
On March 28, 2007, the U.S. District Court for the District of Columbia ruled that it was illegal for horse slaughterhouses to pay the USDA for their own health inspections. The next day USDA pulled their inspectors from Cavel, effectively ending slaughter of horses for human consumption in the United States."
Here is the site that the information is from.
Horse slaughter - Wikipedia, the free encyclopedia