Mizzou and other universities are using an app by Spotter "track" student attendance in class. Is it reasonable to track if a student is in class or not?
Making things simple to know what is happening without the overhead to management has great appeal. Particularly if you have students on scholarship or academic probation, understandable. Maybe even justified.
To what extent is being tracked would make a great Computer Science project to see what is actually being tracked and transmitted. Better yet, work out how to offer a service to make it "look" like you are in class even if you are not.
The testing possibilities are great, particularly in an University environment.