What is the test for a claim for violation of the Fourth Amendment?

To state a claim for violation of the Fourth Amendment arising from a detention, a plaintiff must allege that the detention was without reasonable suspicion. Florida v. Royer, 460 U.S. 491, 500 (1983). Reasonable suspicion exists to the extent "a police officer observes unusual conduct which leads him reasonably to conclude in light of his experience that criminal activity may be afoot...." Terry v. Ohio, 392 U.S. 1, 30 (1968). Furthermore, a person is detained or "seized" within the meaning of the Fourth Amendment "only if, in view of all of the

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