What is the test for questioning or limited investigation under the Fourth Amendment?

person for questioning or limited investigation if the officer has a "reasonable suspicion," based on specific and articulable facts, that some activity relating to crime has taken place or is occurring or is about to occur, and the person he intends to stop or detain is involved in that activity. (United States v. Sokolow (1989) 490 U.S. 1, 7-8; Souza, supra, 9 Cal.4th at p. 231 ["A detention is reasonable under the Fourth Amendment when the detaining officer can point to specific articulable facts that, considered in light of the totality of the circumstances, provide some objective manifestation that the person detained may be involved in criminal activity"].)