Good point. When I said "simply" it was more the fact that all this technology already exists. If you can fit facial ID scanners on a phone, surely you can on a

Good point. When I said "simply" it was more the fact that all this technology already exists. If you can fit facial ID scanners on a phone, surely you can on a self-driving car. And ff you know the clean state of the car, it's not very difficult technically to detect if anything was left in the car. This could even set a flag for some one to remotely check the camera to see if it's a false alarm. Again -- not very difficult on a technical standpoint. However, even bypassing this theoretical "auto-dirty-detector" you could soley rely on the next rider to mark the vehicle as unsanitary which would dispatch them a new ride, while the old one gets dispatched back to the depot for cleaning.