Police earning revenue from tickets write more when they need the money

I would guess that we in America have the least corrupt police forces in the world. I'll even bet that there is not much overt corruption when this situation happens. But when the incentives are there, there will be pressures (maybe even unconscious ones) that bring out an unjust situation. Heck, maybe this means of revenue is the least-bad of all the funding options for police. But let's not ever forget that bad things will happen whenever the incentive exists, no matter how good the institution.

Here is a summary with a news video. And here are some of the articles themselves: "Are Traffic Tickets Countercyclical?" (summary, with a PDF download link) and "Red Ink in the Rearview Mirror: Local Fiscal Conditions and the Issuance of Traffic Tickets" (PDF).