The binding legal principles established are: (1) Section 40(1) of the CPA confers a discretion on police officers whether to arrest (using 'may' not 'must'), which must be exercised properly in light of the Bill of Rights. (2) When arresting a child, police officers must actively consider and accord paramount importance to the child's best interests as mandated by section 28(2) of the Constitution - this is not optional but a constitutional obligation. (3) An arrest of a child that fails to consider the child's best interests, or where such interests are not accorded paramount importance, is unconstitutional and unlawful. (4) Section 28(1)(g) prohibits detention of a child except as a measure of last resort, meaning detention should only occur when all other less invasive methods have been exhausted or are unavailable. (5) Police discretion to arrest must be exercised rationally, in good faith, not arbitrarily, and in compliance with the Bill of Rights - meeting the jurisdictional requirements of section 40(1) alone does not automatically justify arrest. (6) Courts are constitutionally obliged under section 39(1) and (2) to interpret legislation, including the CPA, in a manner that promotes the values underlying the Bill of Rights, particularly when dealing with vulnerable groups like children. (7) Arrest and detention are separate legal processes, each requiring independent constitutional justification.