The Handbook has gone through extensive updates the last few years. The 2021 edition was completely reorganized and rewritten, informing the reader of the latest procedures and technologies utilized in a forensic investigation of a crime. This year’s 2026 edition further updated criminal investigative procedures guiding law enforcement officers through each and every element of a criminal investigation making sure nothing is missed, including updates to: (i) Chapter 1: Strategic Investigation process; (ii) Chapter 3: Crime Scene Investigation; (iii) Chapter 12: Forensic Interviewing and Interrogation; (iv) Chapter 13: Computer Forensics; (v) Chapter 19: Investigation of White-Collar Crimes and Organized Crime; and (vi) Chapter 20: Terrorism Investigation and Homeland Security.