Apple Watch’s new auto-911 calls after falls may tumble into legal trouble

If the Apple Watch detects that the wearer is "immobile for about a minute," it begins a 15-second countdown. After that, the Watch will contact emergency services, which often can use mobile phone data to locate the wearer. (Apple says that the feature is automatically enabled for users who have entered their age into their profile and are over 65.)

In other words, if police are alerted by an Apple Watch of a possible injury, they do not need a warrant to enter a home under the "community caretaking" exception to the Fourth Amendment. This is the notion that law enforcement officers can enter a private space if they reasonably believe that someone needs emergency assistance.