What I saw a lot in Melbourne, and it was certainly more prevalent in the last few years, was unmarked cars on the side of road, parked on nature strips, to catch speeding drivers. Anyone else would be booked for parking in those spaces, but speed cameras can be anywhere they like. I know that's not quite the same, but its more institutional corruption (in my opinion). They rewrite the laws to allow for such things. And that would be fine if people were speeding, but unfortunately 1 or 2 kms over is fair game these days.
Individual corruption like your story is hard to find in Australia these days, but at Government level, there are more examples.
Gah, I hate it when people justify their blatant abuse of power. Two wrongs don't make a right. This story fits more with today's koan so I'm slotting it there.
They justify that they're not committing a violation just because they're on a quest to stop other more major violations. To that effect, other people commit violations because they see people in power being hypocrites. This cycle will never end until authority figures realize this.
Thanks for stopping by, mate!