1) With a car without a VIN number / registration
2) With a car without a license plate
3) With no driver and no way to know who was controlling the car.
The point is, it’s not good to be able to commit serious crimes with zero risk of punishment.
The issue at debate is whether the gain from the legitimate (legal) use cases of technology like this outweigh the loss of making it easier for sex offenders / drug traffickers to more easily subvert authority.