This book is intended to assist State and local law enforcement and other first responders who may be responsible for preserving an electronic crime scene and for recognising, collecting, and safeguarding digital evidence. It is not all inclusive but addresses situations encountered with electronic crime scenes and digital evidence. All crime scenes are unique and the judgement of the first responder, agency protocols, and prevailing technology should all be considered when implementing the information in this guide. First responders to electronic crime scenes should adjust their practices as circumstances -- including level of experience, conditions, and available equipment -- warrant. The circumstances of individual crime scenes and Federal, State, and local laws may dictate actions or a particular order of actions other than those described in this guide. First responders should be familiar with all the information in this guide and perform their duties and responsibilities as circumstances dictate. This is an edited and excerpted edition of a U.S. Dept. of Justice publication.