You don’t understand. There’s no camera on the floor of the car. There are so many times that someone can drop something without even realizing it. You won’t know which paying customer did it.

Someone can have a pen in their back pocket and be scribbling all over the seat without even knowing it. How will any camera catch small dark ink marks on a dark seat in the dark? Your eyes are so much better than that and even they won’t catch everything.