Apple has gotten a patent to remotely disable features on wireless devices based on their location. (This is from a not-always-reliable source, but is verified elsewhere.)
I can’t think of a single legitimate reason to impose blanket blackouts like that based on location (language in the patent to the contrary).
Lots of illegitimate ones, though. Halt recording at protests or public meetings. Or at cop checkpoints. Keep protestors from coordinating with each other on the spot.
Not clear at the moment whether Apple plans to do this only on iPhones (one more reason not to have a smartphone). But no matter what the plans, if such a tech ever actually gets into popular use … well, we will have some monkeywrenching to do, won’t we?
(Tip o’ hat to C^2.)