This report was developed by the Technical Working Group for the Investigation of High Technology Crimes and is intended to be a resource for individuals responsible for investigations involving the Internet and other computer networks. It is one of a series of electronic crime investigation documents already published or in development by the National Institute of Justice (NIJ). The guides are developed by technical working groups that consist of practitioners and subject matter experts brought together by NIJ to help law enforcement agencies and prosecutors deal with the growing volume and complexity of electronic crime.