A recent patent discovered online indicates that Samsung is exploring the possibility of using a breathalyzer connected to your smartphone. Specifically, using the stylus of a phone like the Note9 where the stylus also operates as a breathalyzer that can then check your blood alcohol content.
This feature may not seem like a big deal, but it could serve as a way to prevent people from drunk dialing exes or calling their bosses while drunk.
Since Note devices tend to be more business-focused, it could be very interesting to see the various applications of such a technology, no matter how silly it sounds.
The breathalyzer could also check your blood alcohol content and call you an Uber or a Lyft without asking you since it knows you're not safe to drive. This could prevent a lot of people from trying to drive when they shouldn't be and keep the roads safer.
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Obviously, the legal complications of telling someone whether or not their BAC is clear likely means this feature will never make it to market, but its an interesting idea nonetheless.