On the police department site, it will show the names and photos of the neighborhood police officers assigned to each area. You can contact the officer to find out more information.
You will also want to check out the KBI site for the offenders registry: Search the Kansas Bureau of Investigation's Offender Registry at http://www.accesskansas.org/kbi/offender_registry/
Driving through the neighborhood you are interested in purchasing, will also give you an idea of the activity. Pick different times of the day and different days of the week, to cruise through.