Under what circumstances can a police officer detain an individual for questioning?

A police officer may detain an individual for questioning if the officer has "a reasonable suspicion that the individual is, has been, or is about to be engaged in criminal activity." United States v. Padilla, 548 F.3d 179, 186 (2d Cir.2008). The officer "must be able to point to specific and articulable facts which, taken together with rational inferences from those facts, reasonably warrant the intrusion on a citizen's liberty interest." United States v. Elmore, 482 F.3d 172, 17879 (2d Cir.2007) (alteration omitted). "While the officer may not rely on an inchoate and unparticularized suspicion or hunch, he is entitled to draw on his own experience and specialized training to make inferences from and deductions about the cumulative information available to him that might well elude an untrained person." Padilla, 548 F.3d at 187 (alterations and citation omitted).