> if someone disappears behind a car or building for just a few seconds, then in court they could argue that they weren't the same person
They could argue it, sure. But if that's their only argument they would almost certainly lose because judges and jurors understand the concept of object permanence.
Lose sight for ten minutes with not enough detail to verify whether it's the same person? Reasonable. Hide behind a car for 30 seconds, with footage showing no one else coming or going? Good luck convincing anyone that it was the other guy hiding behind that car.
They could argue it, sure. But if that's their only argument they would almost certainly lose because judges and jurors understand the concept of object permanence.
Lose sight for ten minutes with not enough detail to verify whether it's the same person? Reasonable. Hide behind a car for 30 seconds, with footage showing no one else coming or going? Good luck convincing anyone that it was the other guy hiding behind that car.