Attorneys trying to block plans by two companies to restore domestic horse slaughter say federal officials failed to consider the environmental hazards involved.
Bruce Wagman, a lawyer for a group opposing horse slaughter, told a federal judge in Albuquerque on Friday that horses are given more than 100 drugs not approved for other feed animals.
But lawyers for the federal government say there's no evidence that hazardous materials enter the environment.
The Humane Society of the United States and others are requesting a restraining order to block companies in New Mexico and Iowa from opening their slaughterhouses as planned Monday.
The businesses would be the first to legally slaughter horses in the country since Congress effectively banned the practice in 2006.
Copyright 2013 The Associated Press.