Let's say they record your position every 15 minutes.
(Position can be achieved via Wi-Fi AP names, cell towers, GPS).
Let's say you commute everyday to work on a highway and your average speed is 100 Km/h with sometimes a top speed of 150 Km/h.
Let's say your position shows that you're every workday near a pub from 17:50 to 19:00.
Let's say you're never seen near a gym.
Let's say you're sometimes near a medical center specialized in prostatic care.
[To be continued]