This paper will give an introductory look at how GIS may be applied to policing both internal and external to a police agency through the use of two case examples from the Spokane Police Department. The first example will be the impact of GIS in police investigations. ArcView GIS, along with the ArcView Spatial Analyst and ArcView 3D Analyst extensions, will be used to illustrate how an investigator and analyst together may team up to re-create crime scenes and escape routes and to narrow down the focus of an investigation to the person of highest probability as an offender using data sets found within the police department's records management system, municipal data sets, and police intelligence information. Additionally, a case example will be used to illustrate the role of GIS in community-oriented problem solving. The S-Plus extension to ArcView GIS 3.1 (made by Esri business partner Math Soft) will be used to analyze data received from a Spokane Police Department survey of participants in the neighborhood-level crime prevention organization Block Watch. Such analysis will include regression lines and confidence ratings of the effectiveness of Block Watch groups as a deterrent to neighborhood crime and call incident levels.