Parking boots are used to catch serial parking offenders. These are people that have not paid any of their tickets and are worth a lot of points when caught. One of the most important ways to do this is by placing a parking boots on a car. It prevents it from escaping, which serial offenders will often try to do when you are near. To find them, display the DMV database and select the "Unpaid" category. The cars that are marked with a star are the serial parking offenders. If you choose to track them, they will be highlighted in orange during game play. Offer money to the random hobos to patrol a block for you. If a tracked serial parking offender parks in their block, they will notify you through an alert that appears at the top of the screen. If you build a school, you will eventually be able to hire girl scouts. They are more plentiful than hobos and will work longer.