thats the one thing i always wondered, if they could use a negative, but i was told that it still cant be seen. I suppose with all the high tech computer software out there theres nothing stopping them from finding out the number.
although i was also told that even though they can reverse the image and see the number, half the time they don't bother as it takes up to much time a money.
i agree there are lots of other unique features on most cars that could catch you out, i wouldn't trust it as you say
has anyone actually tried this out, or got it?