Stingrays are typically warrantless; a very different scenario than this case. Their very nature makes them pretty broadly scoped, too, impacting anyone in range.

(I'm of the opinion they're a Fourth Amendment violation, and quite a few court cases are winding their way through the system. Quite a few judges have already ruled against their warrantless use. https://en.wikipedia.org/wiki/Stingray_use_in_United_States_...)