https://www.cnbc.com/2018/06/11/uber-envisions-technology-that-identifies-drunk-passengers.html

Ride-hailing apps, like Uber, have become known as safer alternatives to driving when intoxicated. Now the company is looking to learn a lot more about its late-night riders.

Uber filed a patent application Thursday, first spotted by CNN, that envisions using machine learning to detect whether a potential passenger is behaving abnormally. The patent application is vague about what exactly constitutes an "abnormal state," but seems to be referring to intoxication and fatigue.The system tracks user behavior based on typing speed and accuracy, device angle, walking speed and more. It then compares that data device angle, or walking speed. It plugs that information into an algorithm, along with additional information details about when and where the ride was requested.