Amicus curiae, also known as “friend of the court,” is an individual or organization who is not considered to be of either party in a legal case. They are permitted by the courts as experts who offer their insight regarding issues in a case. Amicus curiae are helpful in a case because they provide an objective perspective regarding a matter in dispute, generally where the public interests are involved, especially if it poses a threat to public health. 

In the United States, amicus curiae are allowed to submit an amicus brief, which are legal documents filed in appellate courts which contain their perspectives. See Whole Woman’s Health v. Hellerstedt, 579 U.S. 582 and a list of 45 amicus briefs submitted to the Supreme Court regarding this case.