It means “friend of the court”. The person is not a party to the case in any manner. His sole purpose is to assist the court by providing substantial information or insight for the smooth disposal of the case.
Proximate cause is an event or an activity that is nearly related to an injury that the courts assume to be the cause of that particular injury.
In constitutional law of the United States, police power is the ability to regulate the behaviour of states and enforce order in their territory for the betterment of the health, safety, morality and general welfare of their residents.
Duress means any kind of threat or coercion that is used to force a person to enter into a contract or to do something against their wishes.