After reading this chapter you will be able to:

• Discuss methods of obtaining crime information from the public, including tip lines, television shows, and AMBER Alerts.
• Discuss how social media can be used by investigators to obtain information in criminal investigations.
• Discuss the role of confidential informants in criminal investigations and their various motivations for providing information to the police.
• Explain why the collection of gang intelligence is useful for criminal investigations.
• Discuss information networks as a source of information in criminal investigations.
• Explain the role of digital devices and digital evidence in investigations.