DES MOINES, Iowa (AP) — The state of Iowa has been sued again in federal court by animal rights groups for passing a law last month designed to prosecute people who get hired at farms in order to work undercover to report on animal living conditions. The measure was approved by lawmakers on March 12 and signed into law by Gov. Kim Reynolds two days later. It creates a trespass charge for anyone using deception to gain access to a farm to cause physical or economic harm.

The lawsuit filed Monday in Des Moines by the Animal Legal Defense Fund and four other groups claims the new law violates constitutional free speech and due process rights. Lawmakers passed it two months after a federal judge struck down a similar law they passed in 2012, saying it violated free-speech rights. That ruling is on appeal to the 8th U.S. Circuit Court of Appeals.