Amicus curiae
An amicus curiae (literally, friend of the court; plural, amici curiae) is someone who is not a party to a case and offers information that affects the case but who has not been asked by any of the parties to assist a court. This may take the form of legal opinion, testimony or learned treatise (the amicus brief). It is a way to introduce concerns that might be overlooked by the parties directly involved in the case. The decision on whether to admit the information lies at the discretion of the court. The phrase amicus curiae is legal Latin.