What is the test for reasonableness of a police officer's suspicion?

In assessing the reasonableness of an officer's suspicion, we must take into account the totality of the circumstances and must evaluate those circumstances through the eyes of a reasonable and cautious police officer on the scene, guided by his experience and training. United States v. Bayless , 201 F.3d 116, 133 (2d Cir.2000) (internal quotation marks omitted); see United States v. Cortez , 449 U.S. 411, 418, 101 S.Ct. 690, 66 L.Ed.2d 621 (1981) ([T]he evidence ... collected must be seen and weighed not in terms of library analysis by scholars, but as understood by

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those versed in the field of law enforcement.).