Those helicopters pursuing O.J. were private helicopters, not subject to jurisdictional restrictions or limitations on their interactions with general citizens. Police Departments have explicit charters that state their purpose and scope. Likely to your chagrin, the words "surveillance" and "intelligence" do not appear in the Baltimore PD's charter. (See below [1]) Furthermore, using airplanes, helicopters, cameras and radio control to pursue someone (note, my specific use of someone) that the police have good reason to believe committed a crime is perfectly fine, and that is the context of the legal doctrines you reference. Do you actually think that the police have articuable suspicion that everyone whose video/cell phone information is being recorded by these surveillance planes has committed a crime? That's to say nothing of the jurisdictional overreach (if not in letter of the law, then in spirit of the law) in asking the FBI to come in and use these toys of war on local citizens who have not committed any federal offenses. The Baltimore PD charter repeatedly makes reference to the "boundaries of the city."

Lastly, you'll notice that the most recent developments in GPS tracking state that warrants are required to use GPS trackers even when police have reasonable suspicion. [2] Since the ostensible reasons for using these drones are to track the movements of individuals, and Stingray devices essentially have that as their sole feature, do you really think it's justified to (quite possibly illegally) track all of these "innocent until proven guilty" citizens using aerial drones? We aren't just talking about a few people who stole a car or are fleeing the scene of a murder. This is wholesale tracking of everyone on the streets -- and possibly in their homes if cell signals are being monitored -- in a 10 mile radius of Inner Harbor.

[1] http://archive.baltimorecity.gov/Portals/0/Charter%20and%20C...

[2] https://en.wikipedia.org/wiki/United_States_v._Jones_(2012)#...