This book Essentials in Criminal Investigation was written in accordance with the course description and course outline of CHED Memorandum Order No. 05 series of 2018 – Policies, Standards and Guidelines for the Bachelor of Science in Criminology program. Furthermore this is aligned with the Criminological Licensure Examination’s Table of Specification for Professional Regulatory Board of Criminology of the Professional Regulation Commission. The topics are discussed in a chronological manner for better comprehension of the students. Every chapter has objectives and review exercises. This is to check if the goals of every chapter are attained. The book is written in a simplified and concised manner for easy understanding among the students.