Here in Australia Police and Traffic work in together, they are not a separate department as far as if you break the law traffic wise, but you do have to go to a different department to obtain or renew licences
They have access to information at the police station on your licence including past addresses etc, (I had mine brought up and I was amazed

at how far the info went back and the amount of info also). I cheekily asked them if they had what brand of toilet paper I used) and was told probably
As its Police Officers along with other Police duties that issue traffic infringements, some general officers get rotated through this section, along with other sections of the Police station or stations.
So its already a done thing here, Police also have an Intel section where they have programs and links to data bases that any self respecting geek would think they are in heaven if they had access.
The only thing what I would call harassment that I received, where I was asked to come to a Police station to answer questions on someone that I knew, (who did not always follow the law

) they said to me that the night in question where someone was robbed, (not something he would do) that he said he was with me, and words to the effect they did not believe this at all and they gave the impression that if I backed up his story I would not be believed.
I told them yes, he was with me and with you also, as I was here at the police station bailing him out from the watch house on another matter altogether and if they checked their own records that this would confirm this.
Needless to say they did check, and no more was said and I was told I could go home, (I made them drive me home) I don't think they where very nice at all, and maybe I was lucky that I did have the best answer in that it could be proved, and apparently my friend was picked out of a line up, (not photo's,) as being the person that did this, and he was at the police station at the time it happened, go figure
I will say if he was not out at the time being an idiot and attracting Police attention, often getting into trouble over stupid things, (while drinking) then I would say, it would not have happened.
Another thing that could have proved he did not do it, is they said the person snatch this girls bag and ran off. My friend had a motorbike accident and for the rest of his life can not run, he is lucky he can walk.
Witch just proves a line up of people, a book with pictures, or a computer with tons of pictures, either way its not always correct, no matter what method you use. just like no computer program is 100% perfect