IIRC the camera result is inadmissable if the photo has more than one car in the shot.
How is it inadmissable? There are always false readings occuring with GATSOs , hence some contries have/are banning them.
For example, one gatso on a three lane road, if a car was to drive at exactly the same speed in each lane the camera would record three completely different speeds, some times upto 10mph apart from closest to->furthest away.
Whicj could effectivly clock some one doing 70mph (actual speed) as a reading of 80mph, therefore incring 3points!