Incentives matter: traffic ticket file

This example is from the Division of Labour blog. E. Frank Stephenson quotes from a article by John Stossel,

Day after day in Warren, Mich., people wait in a long line to pay traffic fines. Many are there because police say they didn't come to a full stop at a stop sign. Often the policeman saying that is Officer David Kanapsky.

On last week's "20/20," you heard a motorist in court insist that she did come to a complete stop. The judge replied, as judges there often do: "I find Officer Kanapsky's testimony to be credible. He is an unbiased witness."

But the officer is not really unbiased. The more tickets he writes, the more overtime he gets. Last year, Kanapsky spent so much time in court he increased his pay by $21,000.