Does the Fourth Amendment protect against a 'fishing expedition' to develop 'reasonable suspicion' to exceed the scope of an initial stop in order to conduct a vehicle search?

question presented is: Does the Fourth Amendment protect against a “fishing expedition” to develop ‘reasonable suspicion’ to exceed the scope of an initial stop in order to conduct a vehicle search? In United States v. Cortez, 449 U.S. 411, 419 (1981), this Court held that reliance on special training is insufficient to establish “reasonable suspicion” to search absent objective factual support. The question presented is: Under the Fourth Amendment did ‘objectively articulable suspicion exist for the drug interdiction officer to exceed the scope of the initial stop of Petitioner, and to request permission _ to search absent objectively articulable suspicion? The question presented is: . Should police possess reasonable articulable suspicion of further criminal activity before pressing a request to search a vehicle?