Yeah, not having a go Iain; but I do more than I get caught for; so I tend to cop it if I was doing the wrong thing.
The rules seem to be pretty different for the Police though; I was handed a fine that listed my Missus car with an incorrect plate, incorrect vehicle and the wrong offence. I queried it with a traffic law specialist; and none of the faults were considered "Fatal errors" (details that would make the ticket void), because they handed the ticket to me.
I was "caught" overtaking on an unbroken centreline, by a police car following at a distance of at least 600 metres. Supposedly they had me "Dead to rights" on the incar footage.
I flat out denied the charge (NOT recommended) as I had completed my overtake before the unbroken line had ended; which he would have known if he'd been in the same suburb as me.
He went off his brain when I requested a viewing of said footage; knowing full well there was no way it would show me committing the offence. He refused at the scene (what a shock!) and I had to request an appointment to view it at Green Valley HWP headquarters.
I subsequently attended and met several very accomodating HWP officers who showed me around their HQ while they found the footage of the "incident".
They have walls COVERED in photographs of of "illegal" modifications to all manner of performance cars; so they can spot them at a glance, which is why I always laugh when people do the old "nah mate, it's all stock" and are then shocked when the Police give them a defect.
If you want to fly under the radar; don't own a WRX, S13, S14, S15, R32,R33 or R34 Skyline; 90% of the pics I saw were of mods to these cars.
Aaanyway, when we viewed the footage; you couldn't see a farkin' thing! My missus car was a tiny speck in the distance, and they followed me for a further 7 km before doing anything. Then, they performed an overtake across an unbroken centreline and took off after me with lights and sirens going 240km/h (according to the speed data on the tape), and pulled me up. The officers watching, said they wouldn't have even bothered, and when told who the issuing officer was; they all exchanged a knowing glance and informed me he was quite "overzealous".
When it became obvious that there was no "evidence" of my illegal overtake on the tape, I told them I'd be contesting the ticket.
They then told me that it still didn't matter as it would be my word against two Police officers; guess how that ends.
So basically; They would stand up in court; effectively lie, and I'd be found guilty. Left a bit of a bad taste in my mouth; but meeting some normal HWP officers (actually all drove some kind of performance car, and didn't treat me like a crim) allowed me to see that they're not all like that one.
As an aside; the tape shows me doing 102km/h in a 100km/h zone, for a few seconds; and if viewed in court; would be added to the list.
If you've ever wondered why officers reduce (round down) the speed on a speeding ticket; it's not because they're being nice. It's so they can have a few other goodies in the bag if you do decide to take it to court. All they have to do is refer to their notes (and trust me, they write down the actual speed); it becomes fact.
I paid the ticket, and moved on.