The power of all federal courts (and most state courts) to declare a particular law or governmental action and invalid because it violates a provision of the constitution is called..

Atherapist at a free university clinic treats elementary school children with behavior problems who are referred by a social service agency. she is also a doctoral candidate who proposes using data she has and will collect about the children for a case-based research project. describe the type of parental permission which is required in this case?